.CS file not visible in Visual Studio

None of the .cs files are opening in the visual studio the solution for that is locate to the below folder at the location
C:\Users\My PC\AppData\Local\Microsoft\VisualStudio\12.0
Folder Name: -
ComponentModelCache
and delete the folder.If the message comes access is denied then check if any instance of the visual studio is running close it then delete the folder and check it worked for me.