csc.exe has stopped working causes Server Error in '/' Application

I too faced the same issue.After I delete files in the bin folder and run the application.The issue is fixed.

I faced the same issue and I would suggest to follow the steps described here:

• Close all instances of Visual Studio 2015 and if they don't do it automatically disappear, end tasks for all the VBCSCompiler processes.
• In your Visual Studio project under Bin folder you will see a roslyn folder (new for VS 2015)
• Delete the roslyn folder and all contents within.
• Restart Visual Studio 2015
• Re Build your project and all should be well again.