Application_Start not being hit in ASP.NET web app

asp.net visual-studio-2008 events web-applications global-asax
Guy picture Guy · Mar 28, 2009 · Viewed 7.5k times · Source

I'm trying to debug something in the global.asax.cs file in an ASP.NET web app and have set a breakpoint in the Application_Start() event however that event is not getting fired when I start the web app inside VS2008. I'm targeting the 3.5 framework.

What could prevent this event from being fired? Or how could I have messed up the project such that this event is no longer wired up?

Answer

splattne picture splattne · Mar 28, 2009

One easy trick to debug newly written code in the global.asax file is to save the web.config file. Each time the config.file is saved, the application is stopped and started.

You could find useful information in this blog entry

Workaround: Debugging Global.aspx.cs Application_Start() with ASP.Net Web Server within Visual Studio

The reason behind this is that we do not kill the ASP.Net Web Server process after your every debug run and hence Application_Start() is not fired every time. There is a good reason why we do so... Starting ASP.Net Web Server process is an expensive task and in most of the scenarios recycling this process after every debug would adversely impact your performance... If you do not want to debug your Application_Start() method then probably you do not need to have the process restart and save performance most of the time...

One of the proposed workarounds:

You can go to your property pages of your web application and enable Edit & Continue like shown below:

alt text

(from the Visual Web Developer Team Blog)

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