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The choice list object of the geoprocessing parameter.
[Visual Basic .NET] Public ReadOnly Property ChoiceList As IGPChoiceList
[C#] public IGPChoiceList ChoiceList {get;}
[C++]
HRESULT get_ChoiceList(
  IGPChoiceList** ChoiceList
);
[C++] Parameters ChoiceList [out, retval]
ChoiceList is a parameter of type IGPChoiceList**
The ChoiceList property is optional; it supplies a choice list for parameter values for the command line.