Debugging an ASP.NET Application

Debugging a Windows Forms application is similar to debugging in Visual Studio 6.0, but debugging a ASP Web App is not as obvious. Thanks to the "BugSlayer" at Tech-Ed, it's not as bad as "all that". You can use the debugger like you normally would do in Visual Studio. You just need to attach a process. This article will bring you through the steps needed to "get attached".

http://www.c-sharpcorner.com/asp/Articles/DebugInASPNETMG.asp