How Can I Keep a C# WinForms Window Always on Top, Even Above Other Topmost Windows?

Always keep the window on top in .NET

In a C# WinForms application, you may need to keep a specific window on top of all other windows at all times. While setting Form.TopMost to true usually works, it may not be enough when another program keeps opening pop-ups that obscure your window.

Revealing the limitations of TopMost

Unfortunately, as Raymond Chen pointed out, there are inherent limitations in creating windows that will not be obscured by new pinned windows from other processes. His article explains why there is no "super pin" window.

An alternative to keeping a window on top

Since it is not possible to create a truly always-on-top window, an alternative is to create a system tray icon for your application. This icon is not obscured by other windows and can be configured to cancel the process when double-clicked. This approach has proven to be an effective workaround in situations where there are challenges in maintaining the window's top position.

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