Assembly Reference for Visual Studio 2005 / 2008http://weblogs.asp.net/sbehera/archive/2008/10/03/assembly-reference-for-visual-studio-2005-2008.aspxYou will always have trouble to reference you right assembly or track the right assembly.Here is on nice tool help you found for visual studio .net http://www.codeproject.com/KB/macros/Lexware.AssemblyReference.aspx Thanks, Suresh BeheraenCommunityServer 2007 SP1 (Build: 20510.895)