The native CRS or the first CRS if the native CRS is not given.
[Visual Basic .NET] Public ReadOnly Property NativeCRS As String
[C#] public string NativeCRS {get;}
[C++]
HRESULT get_NativeCRS(
BSTR* CRS
);
[C++]Parameters
CRS [out, retval] CRS is a parameter of type BSTR
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.