505780 Fix Program that Stopped Working - Already Fully Coded in C#

I have a mass domain name availability checker, that was working perfectly yesterday, and today when you open it, it just immediately closes itself. I have all the source codes files, as well as the compiled .exe The source files have the extension .cs I would need the fixed source files & a working & compiled .exe file returned to me upon project completion. I don't want to publicly post the source files, so if you think you can complete this project, please just ask for the source code via a PM.