Switch Internet Explorer to Offline Mode

I saw a newsgroup post today asking about programmatically (.NET way) switching Internet Explorer to offline mode (checking IE's File | Work Offline menu item). I posted a small C# code that accomplishes this to the newsgroup. Thought would make a blog entry on it for everyone's benefit.

NOTE: This code was tested on Windows XP SP2 and Vista RC1.

[DllImport ("wininet.dll")]
private extern static bool InternetSetOption (int hInternet,
int dwOption, ref INTERNET_CONNECTED_INFO lpBuffer, int dwBufferLength);

[StructLayout (LayoutKind.Sequential)]
struct INTERNET_CONNECTED_INFO
{
  public int dwConnectedState;
  public int dwFlags;
};
private readonly int INTERNET_STATE_DISCONNECTED = 16;
private readonly int INTERNET_STATE_CONNECTED = 1;
private readonly int ISO_FORCE_DISCONNECTED= 1;
private readonly int INTERNET_OPTION_CONNECTED_STATE = 50;

void SetIEConnectionMode (bool offline)
{
  INTERNET_CONNECTED_INFO ici = new INTERNET_CONNECTED_INFO ();

  if (offline)
  {
    ici.dwConnectedState = INTERNET_STATE_DISCONNECTED;
    ici.dwFlags = ISO_FORCE_DISCONNECTED;
  }
  else
  {
    ici.dwConnectedState = INTERNET_STATE_CONNECTED;
  }

  InternetSetOption (0, INTERNET_OPTION_CONNECTED_STATE, ref ici, Marshal.SizeOf (ici));
}