ASP.NET for Persistent SQL Server Session

I gave a problem with ASP.NET application with SQL Server to hold session state. Everyday encounter blocking on the ASPState database. On busy days waiting times increase.
sessionState element in web.config file :
cookieless="false"
sqlConnectionString="Server=iMySQLServer;Integrated Security=SSPI;"
timeout="5"/>
TempGetStateItemExclusive2 is seen in the connection buffers.
1. Why do we see KEY range locks? e.g. KEY: 7:133575514:1 (0a027a6605d7)
2. Why do the connections have two open transactions?

1) Use the persistent version of AspState db which does not use the temp db

HOW TO: Configure ASP.NET for Persistent SQL Server Session State Management:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q311209

2) Add an index to the Expires column in the AspState db

3) Configure the DeleteExpiredSessions job to run every two or three minutes instead of every minute