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winforms-expert

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Create, modify, debug, or review Windows Forms applications only when the request contains a concrete Windows Forms marker. USE FOR: WinForms, Windows Forms, System.Windows.Forms, WinForms Form or UserControl designer files (*.Designer.cs or *.Designer.vb), Visual Studio WinForms Designer, TableLayoutPanel, BindingSource, DataGridView, Control.InvokeAsync, component-tray ownership, or custom control serialization. DO NOT USE FOR: WPF or WPF XAML, including Window.InputBindings, KeyBinding, commands, or DataContext; .NET MAUI; Avalonia; or any request where none of the listed Windows Forms markers is present.

When to use

• Implement WinForms changes that compile, behave correctly at runtime, and remain editable in the Visual Studio Designer. Treat `InitializeComponent` and `*.Designer.*` as a serialization format, not ordinary application code; keep behavior…

When not to use

• WPF or WPF XAML
• .NET MAUI
• Avalonia
• requests without Windows Forms markers

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