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The parameter type.
[Visual Basic .NET] Public Property ParameterType As esriGPParameterType
[C#] public esriGPParameterType ParameterType {get; set;}
[C++]
HRESULT get_ParameterType(
  esriGPParameterType* paramtype
);
[C++]
HRESULT put_ParameterType(
  esriGPParameterType paramtype
);
[C++] Parameters paramtype [out, retval]
paramtype is a parameter of type esriGPParameterType* paramtype [in]
paramtype is a parameter of type esriGPParameterType