SQL Server 2005 Timeout expired exception error

Hi,

I have a program in VB.net that I used to run on Visual Studio 2008 and SQL Server 2000 without any problem.

Now I upgrade to VS2008 and SQL Server 2005 and get and exception while

insert via SqlCommand.ExecuteNonQuery(). the insert is after many inserts to the same table by that program. the CommandTimeout is set to 120 (in the 2000 version I never had to change the default value).

the exception message is:

"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."

Please Help & Thanks in advance...

-- Prasanta