Debugging DD4T with IIS Express

I’ve always thought the only way to debug a DD4T application is to run it on IIS. This is annoying, because the default option that Visual Studio offers is IIS Express or the local development server. So every time I set up a new DD4T project, I created a site in IIS, and changed the project properties accordingly. I must have wasted hours of my life doing this!

The reason why I went through all that trouble, is that it was the only way to run with Tridion’s 64-bit DLLs. Or SO I THOUGHT!

Turns out I have been wrong all along. You can run IIS Express in 64-bit mode by simply changing one registry setting.

  • Open regedit and navigate to HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\12.0\WebProjects
  • Modify or create theREG_DWORD value named “Use64BitIISExpress”
  • Change the value to 1

Now you can run your DD4T applications on your IIS Express, which is the default for Visual Studio 2013. Saves a lot of hassle.

Thanks a lot to Robert Bernstein (