C# - IIS6: Id der WebSite ermitteln

/// <summary>
///   Get website id on <paramref name="websiteName"/>
/// </summary>
/// <param name = "websiteName">Name of the website e.g. test</param>
/// <returns>
///   Less the 0, site does not exist
///   Id of the existing site
/// </returns>
public long GetWebSiteId(string websiteName)
{
  long result = -1;
  using (var w3svc = new DirectoryEntry("IIS://localhost/w3svc"))
  {
    w3svc.RefreshCache();

    foreach (DirectoryEntry site in w3svc.Children)
    {
      using (site)
      {
        site.RefreshCache();
        if (site.Properties["ServerComment"] != null && site.Properties["ServerComment"].Value != null)
        {
          if (site.Properties["ServerComment"].Value.ToString().Equals(websiteName, StringComparison.OrdinalIgnoreCase))
            long.TryParse(site.Name, out result);
        }
      }
    }
  }
  return result;
}