Let's say you've converted a vs 2005 asp .net project over to vs 2008 and you have old ajax references like System.Web.Extensions, etc. that you want to get rid of, but they don't show up under the Solution view. The way to remove those references (or add new ones) is to do the following:
- Right click on the solution (assuming the solution view is active)
- Select Property pages
- At the bottom of the dialog box you'll be able to Add, Remove or update.