Put a breakpoint in the con.Open() line and check the connection string property of connection object. Sometimes the connection string itself referring a wrong location. As the other user said, ADO.NET will throw error if the execute fails. So, you must me referring a wrong database. Zafar Ali Khan 1900 wrote: com.CommandText="insert into <DATABASENAME>.dbo.tbl([Name],FName,Address) values('Angelina','Carlos','sedny')"; replace the <DATABASENAME> with your database name (Full qualifier name). This would help if two or more databases has table in same name and your connection string does not have any Initial Catalog mentioned (default is master database). Better you post your connection string also Castle Rider What if I freeze??? Don't forget to breath... My: Website | Yahoo Group | Blog Spot

Hi Abhishek Thank you for Reply. I am not using Interop services. if used . then their should be exception when i run the plug in. but actually installing successfully and not loading when i add it from the view..Trust Center..Addin

Zafar Ali Khan 1900 wrote: I have developed the addin for outlook 2003 using vs 2008 it is working fine in outlook 2003. But not working in outlook 2007. I guess, The Addin you developed an Windows Application, Not related with ASP.NET. This is ASP.NET Forum. Please asked your question on C# Forum :) Abhijit Jana | Codeproject MVP Web Site : abhijitjana.net Don't forget to click "Good Answer" on the post(s) that helped you.