WCF and .NET 4.0

So I have a server th开发者_高级运维at I host a web app on. It is a ASP.NET web app. I am try to push a second app on this sever. This is a Silverlight app. This uses a WCF service to populate a data grid. The problem is when I install the .Net 3.0 feature of HTTP Activation it kills my ASP.NET app. Is there any way for them to play nicely?

Are you saying that one is a .net 3 app and the other is a .net 4 app? If so, you might need to have them run under different app pools, with each pool set to the correct version of .net. If they share the same app pool, it is quite possible that one app could kill the other.

So It turns out if you turn on WCF in features, you need to reinstall .NET 4 in order for you to be able to use .NET 4 web apps.