How to edit and continue in Visual Studio 2008 and ASP.Net MVC?

For VS2010 try this

You can't 'edit and continue' when the program is running. You must break to edit and continue, and if you have many threads you must break all. If when breaking, some threads continue to run, it not a problem with 'edit and continue' but a problem with the break options.

Note: You don't need to stop the program, but you must break, and then you can continue.

Do you have Enable Optimizations checked? (Advanced Compile Options), I don't think you can have that checked...

Also: http://blogs.msdn.com/webdevelopertips/archive/2008/11/26/tip-29-did-you-know-how-to-enable-edit-and-continue-feature-for-web-application-projects.aspx