Для начала качаем и устанавливаем http://www.mono-project.com/Downloads.

Дальше добавляем references на Mono.Webserver2, Mono.Security и пишем в коде:

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int Port=8080;
string path="\\XSPSamples";
XSPWebSource websource=new XSPWebSource(IPAddress.Any,Port);
ApplicationServer WebAppServer=new ApplicationServer(websource);
//"[[hostname:]port:]VPath:realpath"
string cmdLine=Port+":/:"+path;
WebAppServer.AddApplicationsFromCommandLine(cmdLine);
WebAppServer.Start(true);
Console.WriteLine("Mono.WebServer running. Press enter to exit...");
Console.ReadLine();
WebAppServer.Stop();
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