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Editorial Team
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Asked: 2026-05-19T14:58:09+00:00

I’m loading a COM dll using this method: [DllImport(kernel32, CharSet = CharSet.Unicode, SetLastError =

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I’m loading a COM dll using this method:

[DllImport("kernel32", CharSet = CharSet.Unicode, SetLastError = true)]
private extern static IntPtr LoadLibrary(string librayName);

Should I release the dll using:

[DllImport("kernel32", SetLastError = true)]
private static extern bool FreeLibrary(IntPtr hModule);

or just let the application termination handle it?

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1 Answer

  1. Editorial Team

    You should call FreeLibrary when you’re done using a DLL that you loaded using LoadLibrary. This will not be an issue unless your application is long-running and you load many of these DLLs, or unless you would want to update the DLL on disk (it would be locked as long as it’s loaded).

    By the way, why are you using LoadLibrary to load a COM DLL and not using TLBIMP to create a .NET-accessible wrapper?

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