build C# program

I know nothing about C# and I've inherited a C# demo application and I need someone to help me re-build the application. The C# that I have has about 200 lines of code and there are some other files like a csproj file. I downloaded Visual C# 2008 Express Edition and I'm getting an error message "Custom tool error: unable to import Web/Service/Schema. What I need is someone to get the code built and running and give me a writeup as to how to do it that assumes a knowledgeable software engineer who knows nothing about C#. I will send a zip file to the winning bidder.