Object ID.
[Visual Basic .NET] Public ReadOnly Property OID As Integer
[C#] public int OID {get;}
[C++]
HRESULT get_OID(
long* OID
);
[C++]Parameters
OID [out, retval] OID is a parameter of type long
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.