 <p>Can you break the app into 2 separate web applications that run from the same root directory? Just put the complied C# dll in the bin with the compiled VB.net dll and place all of the aspx pages wherever they would need to be for your site structure.</p> <p>I haven't tried this myself, but it should work. You'll have to create a separate project and reference any data layers, etc. Just move the C# code to the new app and see how that goes. Not the best solution, but it beats converting from one language to another.</p>