Hello,
I have extensive experience in .Net (C#), working in the software development industry for more than five years i have worked on developing complex applications in almost all areas e.g. Desktop apps, web apps, web services, WPF, WCF, Web API etc.
The error you are getting is a known one, it could be resolved with in minutes, an hour at most. Please provide the code or remote access, i can fix it right away.
Thank You