I have a number of .Net web sites built in VS2010 using Framework 4.0that reference a web service to send emails.

My most recent site I created as a web application as opposed to a web site. In the Solution Explorer you can add a 'Service Reference' and, if you click the Advanced button you can then add a reference to a web service.

I did that and now the (web application) site won't build - it says it cannot load the Ajax dll. If I remove the reference to the web service, the site builds okay - if I add the reference back in, the site will not build.

Hmmm, do I need to abandon the idea of using a 'Web Application' and turn it into a 'Web Site'?

Thanks for any help.