My understanding is that you have 2 applications, one in .Net 2003 and this application works fine. The second application is in .Net 2005 and this is not working. Both applications are connecting to the same SQL Server.

Are both of these applications running on the same PC?

Jon

>The server is located in my client branch. it is 2003 version. but not 2005.
>I wonder Should I amend something in my PC ??