Data update

Task/Gotchas/C-sharp/gotchas.cs

@@ -0,0 +1,18 @@
+using System.Diagnostics;
+
+
+// Methods that return values and don't modify the object
+
+int[] arr = [1, 2, 3, 4, 5];
+arr.Reverse();
+Console.WriteLine(string.Join(", ", arr));
+
+
+// Tasks are not threads! There are not 50 threads here even though there are 50 tasks.
+// See https://blog.stephencleary.com/2013/11/there-is-no-thread.html
+
+Console.WriteLine(Process.GetCurrentProcess().Threads.Count);
+Task[] tasks = [.. Enumerable.Range(0, 50).Select(i => Task.Delay(1000))];
+Console.WriteLine(Process.GetCurrentProcess().Threads.Count);
+Task.WaitAll(tasks);
+Console.WriteLine(Process.GetCurrentProcess().Threads.Count);