I am writing a Visual Studio 2012 Add-in using C#, .NET 4.5. Generally, I have been making some changes, run the Add-in in debug mode (which opens in a new instance of VS), test out my changes, etc. This has been working just fine until recently. Recently, I added a new method to a class in a DLL that my add-in references. I am able to see the new method in Intellisense just fine, can code against the method, the add-in builds just fine, etc. As before, I attempt to debug the code and test my changes, however, when I get to a method whose body makes a call to the new method I added in the referenced DLL, the call fails with a "System.MissingMethodException" indicating that the new method I added does not exist/cannot be found (note: the debugger will not even step into the method body). I've reviewed several other similar posts (most seem to relate to debugging ASP.NET) and tried all the suggestions provided w/o any success. Has anyone see this happen before and/or have any additional suggestions?
As a side note, I have tried changing the name of the method I added in the DLL and tried debugging... no luck. Same error reported, just with the new method name I used. Only way I have got it to work so far is to remove the call to my new method (which, of course, is no good since I need it in the end).
Other posts I've explored:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/c76c57d8-e961-47d4-b7c2-59f1f43885ad/visual-studio-20122013-builds-old-code?forum=vsdebug and the various links it points to