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Asked: 2026-05-29T22:47:28+00:00

I have C# control derived from UserControl. When I close the design view of

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I have C# control derived from UserControl. When I close the design view of a form incorporating this control Visual Studio crashes. On XP I get the opportunity to debug the crash and I can see it is throwing a DLL not found exception on an API in a C dll. If I comment out the call to this function it stops the crash. Is closing the design view actually calling my dispose method? Why am I getting the DLL (or entry point) not found exception and what should I do to stop this happening?

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  1. Editorial Team

    If the C DLL is not available to Visual Studio at design-time you either need to put it in a place where Visual Studio can find it or add code to your control to check if you are in design mode and avoid making calls to the DLL.

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