Global.asax « ASP.Net Instroduction « ASP.NET Tutorial

1.6.1.The global.asax Application File
1.6.2.Some events don't fire with every request:
1.6.3.Global application file. (C#)
1.6.4.Appication level event handlers in global.asax
1.6.5.Global.asax file can be used to track the number of page requests made for any page.
1.6.6.Application level action sequence
1.6.7.Static application variables
1.6.8.Override string GetVaryByCustomString in Global.asax (C#)
1.6.9.Override string GetVaryByCustomString in Global.asax (VB)

1.6.10.Log exception in Global.asax (C#)
1.6.11.Log exception in Global.asax (VB)