Why am I unable to get Site.State for an FTP site, when using Microsoft.Web.Administration?

Using the following C# code:

using System;
using Microsoft.Web.Administration;

namespace getftpstate
{
  class Program
  {
    static void Main(string[] args)
    {
      ServerManager manager = new ServerManager();
      foreach (Site site in manager.Sites)
      {
        Console.WriteLine("name: " + site.Name);
        Console.WriteLine("state: " + site.State);
        Console.WriteLine("----");
      }
    }
  }
}

I get the following output:

C:\projects\testiisftp\getftpstate\getftpstate\bin\Debug>getftpstate.exe
name: Default Web Site
state: Stopped
----
name: Default FTP Site

Unhandled Exception: System.Runtime.InteropServices.COMException (0x800710D8): T
he object identifier does not represent a valid object. (Exception from HRESULT:
 0x800710D8)
   at Microsoft.Web.Administration.Interop.IAppHostProperty.get_Value()
   at Microsoft.Web.Administration.ConfigurationElement.GetPropertyValue(IAppHos
tProperty property)
   at Microsoft.Web.Administration.Site.get_State()
   at getftpstate.Program.Main(String[] args) in C:\projects\testiisftp\getftpst
ate\getftpstate\Program.cs:line 17

Any ideas why I might be seeing the above 0x800710D8 COM error? I'm able to manage the FTP site just fine using IIS manager (I can start, stop, change settings, etc).

The first thing to clarify is that Site.State is a property to get the state of the HTTP protocol and for that reason my guess is that the site that is throwing that exception is probably NOT an HTTP site.

If you want to get the FTP state you need to do is:

int ftpState = Site.GetChildElement("ftpServer")["state"]

You can verify if a site is HTTP or not by inspecting the Site.Bindings and looking for the Protocol property, if it does not have HTTP or HTTPS you will get the exception above which you could safely ignore.

For more information: IIS.net FTP Settings / Sample Code