I am really troubled with this error and its the first time I had ever since I am using Visual Studio 2012. The error says 'Unhandled exception : System.InvalidOperationException'.
I, at least, understand that it's trying to say something related to operation of my program but I am unable to handle this exception. Its a run-time error which I couldn't handle it. If any one of you know how to handle this, please reply. I need your help. Thank You