Using c++ library in c#

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If it is a “normal” DLL (not COM, not managed C++), you cannot add a reference like this. You have to add p/invoke signatures (external static method definitions) for the exports you want to call in your DLL.

[DllImport("yourdll.dll")]
public static extern int ExportToCall(int argument);

Have a look at the DllImport attribute in the online help.

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