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Interface not valid for Implements

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Not all interfaces can be implemented in Visual Basic. This error has the following cause and solution:

  • The interface contains some element that can't be supported by Visual Basic. For example, Visual Basic has no equivalent to the unsigned long integer type, Visual Basic can't designate a procedure parameter as "out-only." Although Visual Basic supports the use of the underscore character (_) in Visual Basic identifiers, it can't implement an interface that uses underscore characters in the names of its members.

    You can't implement the interface in Visual Basic.

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