You can use the Add Method Wizard to add a method to an interface in your project. If the project contains a class associated with the interface, the wizard modifies the class, too.
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In Class View, expand the project node to display the interface to which you want to add the method.
[!NOTE] You can also add methods to dispinterfaces, which, unless the project is attributed, are located under the library node.
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Right-click the name of the interface.
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On the shortcut menu, click Add, and then click Add Method.
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In the Add Method Wizard, provide the information to create the method.
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Specify any interface definition language settings for this method in the IDL attributes page of the wizard.
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Click Finish to add the method.
