Get IIS site name from for an ASP.NET website

System.Web.Hosting.HostingEnvironment.ApplicationHost.GetSiteName();

As @belugabob and @CarlosAg already mentioned I'd rather use System.Web.Hosting.HostingEnvironment.SiteName instead of System.Web.Hosting.HostingEnvironment.ApplicationHost.GetSiteName() because IApplicationHost.GetSiteName method is not intended to be called directly! (msdn)

So you're better off using HostingEnvironment.SiteName property! (msdn)

I think this should be the correct answer in respect to the documentation ;)

Here is a related post in retrieving the site Id.

Here some code that might work for you:

using System.DirectoryServices;
using System;

public class IISAdmin
{
   public static void GetWebsiteID(string websiteName)
   {
      DirectoryEntry w3svc = new DirectoryEntry("IIS://localhost/w3svc");

     foreach(DirectoryEntry de in w3svc.Children)
     {
        if(de.SchemaClassName == "IIsWebServer" && de.Properties["ServerComment"][0].ToString() == websiteName)
        {
           Console.Write(de.Name);
        }

     }

  }
  public static void Main()
  {
     GetWebsiteID("Default Web Site");
  }

}

Here's the link to the original post.

I'm not sure if it will work on IIS7, but if you install the IIS6 compatibility components for IIS7 it should work.