Storing session data in Sql Server database using ASP.Net

I am trying to store session information in sql server using asp.net.I have set the state mode to sql server and have also executed the aspnet_state.exe with -p option as i want to store data persistently.

Now when i run my application each time a new session is crated and it overwrites the first row of the session data table rather than beiing inserted in next rows.

I cannot understand the problem.

Please help.