The Unmanaged code debugging property, available on the Debug page of the Project Designer, determines whether debugging of native code is supported. Select this option if you are making calls to COM objects, or if you start a custom program written in native code that calls your project and you need to debug the native code.
To enable debugging of unmanaged code
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With a project selected in Solution Explorer, on the Project menu, click Properties.
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Click the Debug tab.
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Select the Enable unmanaged code debugging check box.
To disable debugging of unmanaged code
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With a project selected in Solution Explorer, on the Project menu, click Properties.
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Click the Debug tab.
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Click to clear the Enable unmanaged code debugging check box.
See Also