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Test the existence of a given parameter value (GPValue or catalog path) the type of the data is optional.
[Visual Basic .NET]
Public Function Exists ( _
    ByVal inputValue As Object, _
    ByRef pDataType As Object _
) As Boolean
[C#]
public bool Exists (
    object inputValue,
    ref object pDataType
);
[C++]
HRESULT Exists(
  VARIANT inputValue,
  Variant* pDataType
);
[C++] Parameters inputValue [in]
inputValue is a parameter of type VARIANT pDataType [in]
pDataType is a parameter of type VARIANT*