So I just performed the coup de gras on my project by accidentally clicking on Exclude From Project
instead of Add
on my controllers folder.
Wh
In my ASP.Net Webforms project after excluding the file I could't find it even under 'Show all files', but they were at project folder so I had to right click on project in Visula Studio then add existing item.
Click on the Show All Files
icon in the solution explorer and then simply include the folder:
Visual Studio Express 2012
Select Your Project Folder Click On "Show All Files" icon to show all Excluded Folders And Files
Then Right Click on Excluded Folder or File and Click on "Include In Project"
For anyone wanting a different solution, you can also browse to your project in a File Explorer and delete the offending folder (Be sure to copy it somewhere safe first!). Restart Visual Studio and proceed to add the folder as you regularly would.