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Home/ Questions/Q 47763
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Asked: May 10, 20262026-05-10T16:10:25+00:00 2026-05-10T16:10:25+00:00

I want to make a .NET Form as a TopMost Form for another external

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I want to make a .NET Form as a TopMost Form for another external App (not .NET related, pure Win32) so it stays above that Win32App, but not the rest of the apps running.

I Have the handle of the Win32App (provided by the Win32App itself), and I’ve tried Win32 SetParent() function, via P/Invoke in C#, but then my .NET Form gets confined into the Win32App and that’s not what I want.

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  1. 2026-05-10T16:10:26+00:00Added an answer on May 10, 2026 at 4:10 pm

    I think you’re looking for is to P/Invoke SetWindowLongPtr(win32window, GWLP_HWNDPARENT, formhandle)

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