method GUIDString.
ERROR: Syntax information about IGUIDHelper.GUIDString may not be in D:\ArcGIS\DotNet\ESRI.ArcGIS.SystemUtility.dll
[C++]
HRESULT GUIDString(
BSTR* bsGUID
);
[C++]Parameters
bsGUID [out, retval] bsGUID is a parameter of type BSTR