Here is how to start the standalone server that comes with VS.net 2005 and higher from the command line:
Start /B C:\WINDOWS\Microsoft.NET
\Framework\v2.0.50727\WebDev.WebServer.exe /port:1234 /path:"C:\YourWebSitePath"
If you place this line in a bat file you can start your web server by running the bat file.
WebDev.WebServer.exe is the web server.