diff --git a/EssentialCSharp.Web/wwwroot/js/chapter-listings.json b/EssentialCSharp.Web/wwwroot/js/chapter-listings.json
new file mode 100644
index 00000000..fcc93526
--- /dev/null
+++ b/EssentialCSharp.Web/wwwroot/js/chapter-listings.json
@@ -0,0 +1,2524 @@
+{
+  "description": "Essential C# Listing Source Code Files",
+  "generated_by": "generate_listings_json.py",
+  "chapters": {
+    "Chapter01": [
+      {
+        "filename": "01.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "01.22.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter02": [
+      {
+        "filename": "02.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.34.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.35.cs",
+        "can_run": true
+      },
+      {
+        "filename": "02.36.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter03": [
+      {
+        "filename": "03.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "03.31.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter04": [
+      {
+        "filename": "04.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.34.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.35.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.36.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.37.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.38.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.39.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.40.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.41.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.42.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.43.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.44.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.45.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.46.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.47.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.48.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.49.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.50.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.51.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.52.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.53.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.54.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.55.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.56.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.57.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.58.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.59.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.60.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.61.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.62.cs",
+        "can_run": true
+      },
+      {
+        "filename": "04.63.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter05": [
+      {
+        "filename": "05.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "05.34.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter06": [
+      {
+        "filename": "06.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.34.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.35.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.36.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.37.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.38.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.39.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.40.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.41.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.42.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.43.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.44.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.45.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.46.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.47.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.48.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.49.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.50.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.51.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.52.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.53.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.54.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.55.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.56.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.57.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.58.cs",
+        "can_run": true
+      },
+      {
+        "filename": "06.59.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter07": [
+      {
+        "filename": "07.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "07.34.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter08": [
+      {
+        "filename": "08.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "08.14.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter09": [
+      {
+        "filename": "09.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.34.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.35.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.36.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.37.cs",
+        "can_run": true
+      },
+      {
+        "filename": "09.38.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter10": [
+      {
+        "filename": "10.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "10.20.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter11": [
+      {
+        "filename": "11.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "11.08.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter12": [
+      {
+        "filename": "12.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.33.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.34.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.35.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.36.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.37.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.38.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.39.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.40.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.41.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.42.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.43.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.44.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.45.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.46.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.47.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.48.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.49.cs",
+        "can_run": true
+      },
+      {
+        "filename": "12.50.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter13": [
+      {
+        "filename": "13.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "13.26.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter14": [
+      {
+        "filename": "14.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "14.17.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter15": [
+      {
+        "filename": "15.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "15.29.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter16": [
+      {
+        "filename": "16.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "16.17.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter17": [
+      {
+        "filename": "17.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "17.21.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter18": [
+      {
+        "filename": "18.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.20.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.21.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.22.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.23.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.24.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.25.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.26.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.27.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.28.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.29.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.30.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.31.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.32.cs",
+        "can_run": true
+      },
+      {
+        "filename": "18.33.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter19": [
+      {
+        "filename": "19.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "19.10.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter20": [
+      {
+        "filename": "20.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "20.16.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter21": [
+      {
+        "filename": "21.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "21.10.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter22": [
+      {
+        "filename": "22.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.12.cs",
+        "can_run": true
+      },
+      {
+        "filename": "22.13.cs",
+        "can_run": true
+      }
+    ],
+    "Chapter23": [
+      {
+        "filename": "23.01.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.02.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.03.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.04.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.05.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.06.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.07.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.08.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.09.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.10.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.11.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.13.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.14.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.15.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.16.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.17.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.18.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.19.cs",
+        "can_run": true
+      },
+      {
+        "filename": "23.20.cs",
+        "can_run": true
+      }
+    ]
+  },
+  "statistics": {
+    "total_chapters": 23,
+    "total_listings": 617
+  }
+}
\ No newline at end of file
diff --git a/EssentialCSharp.Web/wwwroot/js/trydotnet-module.js b/EssentialCSharp.Web/wwwroot/js/trydotnet-module.js
index f7cd3689..0c51c77a 100644
--- a/EssentialCSharp.Web/wwwroot/js/trydotnet-module.js
+++ b/EssentialCSharp.Web/wwwroot/js/trydotnet-module.js
@@ -42,19 +42,98 @@ function isTryDotNetConfigured() {
     return typeof origin === 'string' && origin.trim().length > 0;
 }
 
+// ── Runnable-listings data (loaded once from chapter-listings.json) ──────────
+
+/** @type {Promise<Set<string>>|null} */
+let _runnableListingsPromise = null;
+
 /**
- * Creates scaffolding for user code to run in the TryDotNet environment.
- * @param {string} userCode - The user's C# code to wrap
- * @returns {string} Scaffolded code with proper using statements and Main method
+ * Loads chapter-listings.json (once) and builds a Set of normalised
+ * "chapter.listing" keys, e.g. "1.3", "12.50".
+ * Only includes listings where can_run is true.
+ * @returns {Promise<Set<string>>}
  */
-function createScaffolding(userCode) {
-    return `using System;
+function loadRunnableListings() {
+    if (_runnableListingsPromise) return _runnableListingsPromise;
+
+    _runnableListingsPromise = fetch('/js/chapter-listings.json')
+        .then(res => {
+            if (!res.ok) throw new Error(`Failed to load chapter-listings.json: ${res.status}`);
+            return res.json();
+        })
+        .then(data => {
+            const set = new Set();
+            const chapters = data.chapters || {};
+            for (const [, files] of Object.entries(chapters)) {
+                for (const fileObj of files) {
+                    // fileObj is now { filename: "01.03.cs", can_run: true }
+                    if (!fileObj.can_run) continue; // Skip listings that can't be run
+                    
+                    const filename = fileObj.filename;
+                    // filename looks like "01.03.cs" → chapter 1, listing 3
+                    const m = filename.match(/^(\d+)\.(\d+)\./);
+                    if (m) {
+                        set.add(`${parseInt(m[1], 10)}.${parseInt(m[2], 10)}`);
+                    }
+                }
+            }
+            return set;
+        })
+        .catch(err => {
+            console.warn('Could not load runnable listings:', err);
+            return new Set(); // graceful degradation — no Run buttons
+        });
+
+    return _runnableListingsPromise;
+}
+
+/**
+ * Checks whether a listing is present in the curated runnable set.
+ * @param {string|number} chapter
+ * @param {string|number} listing
+ * @returns {Promise<boolean>}
+ */
+async function isRunnableListing(chapter, listing) {
+    const set = await loadRunnableListings();
+    return set.has(`${parseInt(chapter, 10)}.${parseInt(listing, 10)}`);
+}
+
+/**
+ * Strips #region / #endregion directive lines (INCLUDE, EXCLUDE, etc.)
+ * from source code while keeping the code between them intact.
+ * @param {string} code - Raw source code
+ * @returns {string} Code with region directive lines removed
+ */
+function stripRegionDirectives(code) {
+    return code.replace(/^\s*#(?:region|endregion)\s+(?:INCLUDE|EXCLUDE).*$/gm, '').trim();
+}
+
+// Common using directives that mirror the SDK's implicit global usings.
+// These are needed because TryDotNet's 'console' package does not inject them.
+const COMMON_USINGS = `using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Globalization;
-using System.Text.RegularExpressions;
+using System.Text.RegularExpressions;`;
+
+/**
+ * Prepends COMMON_USINGS to code that has no using directives of its own.
+ * @param {string} code - Source code
+ * @returns {string}
+ */
+function prependUsings(code) {
+    if (/^\s*using\s+/m.test(code)) return code; // already has usings
+    return `${COMMON_USINGS}\n\n${code}`;
+}
 
+/**
+ * Creates scaffolding for user code to run in the TryDotNet environment.
+ * @param {string} userCode - The user's C# code to wrap
+ * @returns {string} Scaffolded code with proper using statements and Main method
+ */
+function createScaffolding(userCode) {
+    return `
 namespace Program
 {
     class Program
@@ -222,7 +301,7 @@ export function useTryDotNet() {
         const files = [{ name: fileName, content: fileContent }];
         const project = { package: 'console', files: files };
         const document = isComplete 
-            ? { fileName: fileName } 
+            ? fileName 
             : { fileName: fileName, region: 'controller' };
 
         const configuration = {
@@ -357,8 +436,10 @@ export function useTryDotNet() {
 
     /**
      * Checks if code is a complete C# program that doesn't need scaffolding.
-     * Complete programs must have a namespace declaration with class and Main,
-     * or be a class named Program with Main.
+     * A program is "complete" when it contains a namespace declaration, OR
+     * when it defines any class with a static Main method.
+     * Top-level statement files (no class, no namespace) return false and
+     * will be wrapped by createScaffolding().
      * @param {string} code - Source code to check
      * @returns {boolean} True if code is complete, false if it needs scaffolding
      */
@@ -366,28 +447,11 @@ export function useTryDotNet() {
         // Check for explicit namespace declaration (most reliable indicator)
         const hasNamespace = /namespace\s+\w+/i.test(code);
         
-        // Check if it's a class specifically named "Program" with Main method
-        const isProgramClass = /class\s+Program\s*[\r\n{]/.test(code) && 
+        // Check if any class has a static Main method
+        const hasClassWithMain = /class\s+\w+/.test(code) && 
                               /static\s+(void|async\s+Task)\s+Main\s*\(/.test(code);
         
-        // Only consider it complete if it has namespace or is the Program class
-        return hasNamespace || isProgramClass;
-    }
-
-    /**
-     * Extracts executable code snippet from source code.
-     * If code contains #region INCLUDE, extracts only that portion.
-     * Otherwise returns the full code.
-     * @param {string} code - Source code to process
-     * @returns {string} Extracted code snippet
-     */
-    function extractCodeSnippet(code) {
-        // Extract code from #region INCLUDE if present
-        const regionMatch = code.match(/#region\s+INCLUDE\s*\n([\s\S]*?)\n\s*#endregion\s+INCLUDE/);
-        if (regionMatch) {
-            return regionMatch[1].trim();
-        }
-        return code;
+        return hasNamespace || hasClassWithMain;
     }
 
     /**
@@ -403,8 +467,17 @@ export function useTryDotNet() {
         }
         const data = await response.json();
         const code = data.content || '';
-        // Extract the snippet portion if it has INCLUDE regions
-        return extractCodeSnippet(code);
+
+        // Complete programs (namespace or class+Main) are sent as-is, but
+        // with common usings prepended when the file has none — TryDotNet's
+        // 'console' package does not provide SDK implicit global usings.
+        // Top-level statement files get region directives stripped so the
+        // scaffolding wrapper doesn't contain raw #region lines.
+        if (isCompleteProgram(code)) {
+            // return prependUsings(code);
+            return code;
+        }
+        return stripRegionDirectives(code);
     }
 
     /**
@@ -502,12 +575,19 @@ export function useTryDotNet() {
     /**
      * Injects Run buttons into code block sections.
      * Skipped entirely when TryDotNet origin is not configured.
+     * Only adds buttons for listings present in chapter-listings.json.
      */
-    function injectRunButtons() {
+    async function injectRunButtons() {
         if (!isTryDotNetConfigured()) {
             return; // Don't show Run buttons when the service is not configured
         }
 
+        // Pre-load the runnable listings set so we can check membership below
+        const runnableSet = await loadRunnableListings();
+        if (runnableSet.size === 0) {
+            return; // JSON failed to load or is empty — no buttons
+        }
+
         const codeBlocks = document.querySelectorAll('.code-block-section');
 
         codeBlocks.forEach((block) => {
@@ -553,8 +633,8 @@ export function useTryDotNet() {
                 });
             }
 
-            // Only add button for listing 1.1
-            if (chapter === '1' && listing === '1') {
+            // Only add button for listings present in the curated JSON
+            if (chapter && listing && runnableSet.has(`${parseInt(chapter, 10)}.${parseInt(listing, 10)}`)) {
                 // Wrap existing content in a span to keep it together
                 const contentWrapper = document.createElement('span');
                 while (heading.firstChild) {