May 11, 2010 03:58 PM|aderegil|LINK
I think the problem is that the web application is findind two times the definition of your class. We need to review the project type because maybe the application is compiling the code on the very first request but it is also trying to compile your .cs
code so it finds a duplicate.
Are you familiar with project types in visual studio?
Do you have a web site project or a web application project?
How do you deploy your application?
Let's take a look at these issues and start working from there.