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Checks if a data element exists.
[Visual Basic .NET] Public Function Exists ( _ ByVal pGPValue As IGPValue _ ) As Boolean
[C#] public bool Exists ( IGPValue pGPValue );
[C++]
HRESULT Exists(
IGPValue* pGPValue
);
[C++] Parameters pGPValue [in]
pGPValue is a parameter of type IGPValue*