C#.net 2008 startup

Question

I have a question about the startup code in C#.Net 2008. I have not looked at C#.net code in several years and now I have a c#.sln project that I need to work with.
 I am trying to find where the code actually starts. I found the startup project folder.
These project contains lots of C# modules. Can you tell me how I can tell where the code actually starts in the startup project?  Would I look for a main.cs file?
  Should I just step through the code to see where the application actually starts? If so, what should I do to make certain this code will not actually run the production application?