[DllImport("ole32.dll", SetLastError = true)]
public static extern int OleCreateLink(
IOleClientSite pClientSite,
[MarshalAs(UnmanagedType.LPStruct)] Guid rclsid,
uint renderopt,
ref FORMATETC pFormatEtc,
IOleClientSite pClientSite2,
IStorage pStg,
out object ppvObj
);