error C2057: expected constant expression

After making a dialog using and using the Wizard to make a class The code compiles OK.

When I include the header file for this new class  #include "mydialog.h"  in CMainFrame the coimpiler complains.

error C2065: 'IDD_DIALOG_1' : undeclared identifier
error C2057: expected constant expression

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hansw77041Author Commented:
Answering my own question.
I have no idea why including the  #include "resource.h" in the Cmydialog get rid of the error but it does.

>>I have no idea why including the  #include "resource.h" in the Cmydialog get rid of the error

Becuase that file is maintained by the resource editor and this one put the definition of IDD_DIALOG_1 right in there. All resources need to have an uniqe identifier, and whenever you create a resource with Visual Studio, it will #define this one in 'resource.h' by default.

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