For WebForms you need to have a httpModule registered as 

<system.webServer>
<modules runAllManagedModulesForAllRequests="true">
<add name="UrlRewriteModule" type="EPiServer.Web.RoutingUrlRewriteModule, EPiServer" preCondition="managedHandler" />
..other modules

Cassini uses the "old" IIS configruation element (like httpModules instead of modules and so on). 

Thank you, but unfortunately it didn´t help. The url:s still look like this: http://localhost:50523/Templates/EntrancePage.aspx?id=505&epslanguage=sv It´s the same if i run in IIS or IIS-express. Not just in Cassini.

Hello again!

Now it´s working in IIS and IIS-express. I was wrong in my last answer. Thanks for your help!

I have had the similar problem. But only in editmode. when editing an url in edit mode I get an non friendly url and also get a link with a guid and the page id at the end. Am i doing something wrong cause render in templete is working great though?