tryType AcrobatType;AcrobatType = Type.GetTypeFromCLSID(new System.Guid
("{72498821-3203-101B-B02E-04021C009402}"));
    
avdoc= (Acrobat.CAcroAVDoc) Activator.CreateInstance
(AcrobatType);see
http://www.dotnet247.com/247reference/msgs/11/57853.aspx