Returns the number of old (superseded) libraries detailed in this extension.
ERROR: Syntax information about ILibLookupExtension.OldLibraryCount may not be in D:\ArcGIS\DotNet\ESRI.ArcGIS.SystemUtility.dll
[C++]
HRESULT get_OldLibraryCount(
long* lCount
);
[C++]Parameters
lCount [out, retval] lCount is a parameter of type long