sqlserver 2005 database and .net C#

i am designing a web appliation i am inserting the login time and logout time of a user in a database, global.asax in session_end i wrote insert statement but when connected to local machine and local sqlserver 2005 its inserting data but when connecting to web server on net its not inserting the data into the table in session_end the signout is also working but the insert is working but inserting into the database. what should i do.

please help me.
i am trying since three days.
its urgent please help me.