Compiling C# program with Request object

Hello all,

I want to write a little CGI program that I can run under IIS, and I'm some what stumped - here is what I have:

public class Test
{
        static void Main()
        {
                Console.Write( "Content-type: text/html\n\n" );
                System.Console.WriteLine( System.Web.HttpContext.Current.Request.ServerVariables["HTTP_USER_AGENT"] );
        }
}

Which is all well can good - it compiles with "gmcs -out:text.exe test.cs -r:System.Web". But then I transfer the .exe file to my Windows machine and try to run it as a CGI program I get:

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.

So the question is, how can I compile a C# application with Mono using the 'Request' object and have it available under a IIS CGI environment. Or should I be accessing the CGI variables in some different manner?

Thanks
Allan