WCF Service Reference Update Fails

Question

I'm new to WCF and I want to update the service reference. However, I get the message: "Could not load file or assembly 'ManageDHCP' or one of its dependencies. An attempt was made to load a program with an incorrect format." when I try right clicking the service reference in Visual Studio 2013 > Update Service Reference.

Before I was using 32-bit ManageDHCP.dll in my service; however I found out that I needed to use the 64-bit ManageDHCP.dll so I went and replaced that then configured the build's platform target and platform of the service to x64 which by itself builds fine. Why does it still fail though?

Answer 1

So the answer was was that I was running Visual Studio 2013, which apparently the default when you install is set to run IIS Express (32-bit version). This has issues when you have 64-bit projects/dlls.

I fixed this by going up to the menus and checking the box for:

Tools | Options | Projects and Solutions | Web Projects | Use the 64 bit version of IIS Express…

Further reading: http://blogs.msdn.com/b/rob/archive/2013/11/14/debugging-vs2013-websites-using-64-bit-iis-express.aspx