How to programmatically determine installed IIS version

Question

What would the preferred way of programmatically determining which the currently installed version of Microsoft Internet Information Services (IIS) is?

I know that i

Answer 1

You could build a WebRequest and send it to port 80 on a loopback IP address and get the Server HTTP header.

HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create("http://127.0.0.1/");
HttpWebResponse myHttpWebResponse = null;
try
{
    myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
}
catch (WebException ex)
{
    myHttpWebResponse = (HttpWebResponse)ex.Response;
}
string WebServer = myHttpWebResponse.Headers["Server"];
myHttpWebResponse.Close();

Not sure if that's a better way of doing it but it's certainly another option.