hi try this
using sessionstate in webconfig
<sessionState cookieless="UseCookies" timeout="20" regenerateExpiredSessionId="true" useHostingIdentity="true">
</sessionState>
it will expire for 20 minutes
and in appsettings
<add key="dbConn" value="Data Source=ythisbug;User ID=sa;Password=password;Pooling=True;Max Pool Size=200;Connect Timeout=200" />
try this..
All The Best..