Initial commit: .NET practice project

Added CSharp, Nots, and Wpf directories with various practice exercises and projects.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Wpf/Prism1/ModuleA/Views/ViewC.xaml.cs

@@ -0,0 +1,19 @@
+using System.Windows;
+using System.Windows.Controls;
+using ModuleA.Event;
+using Prism.Events;
+
+namespace ModuleA.Views;
+
+public partial class ViewC : UserControl
+{
+    public ViewC(IEventAggregator aggregator)
+    {
+        InitializeComponent();
+        var messageEvent = aggregator.GetEvent<MessageEvent>();
+        messageEvent.Subscribe(arg =>
+        {
+            MessageBox.Show(arg);
+        });
+    }
+}