http://msmvps.com/blogs/rakeshrajan/archive/2005/08/07/61937.aspxIn .NET 1.x, the session start event would be invoked if an unhandled exception propagates out of the application scope (in additional to the normal invocation). This meant that the code in the session start event handler may be called multiple timesenCommunityServer 2008.5 SP2 (Build: 40407.4157)