C#

[DllImport("Netapi32")]
private static extern int NetServerEnum(
    string servername, //must be null
    int level, //101
    out IntPtr buffer,
    int maxlen, //out
    out int entriesread, //out
    out int totalentries, //out
    int servertype, //in 3 = all
    string domain, //null primary
    int resumehandle); //must be 0


[DllImport("Netapi32")]
private static extern int NetApiBufferFree(IntPtr ptr);


[StructLayout(LayoutKind.Sequential)]
internal class ServerInfo 
{
    public int platformid;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string name;
    public int majorver;
    public int minorver;
    public int type;
    [MarshalAs(UnmanagedType.LPWStr)]
    public string comment;
}


class MachineConvertor : TypeConverter 
{
    public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
    {
      int eread, etot;
      IntPtr buffer;
      int l = 200;     
      int size = Marshal.SizeOf(typeof(ServerInfo));
      int res = NetServerEnum(
          null, 
          101, 
          out buffer, 
          size * l, 
          out eread, 
          out etot, 
          3, 
          null, 
          0);

      IntPtr p = buffer;
      ArrayList arr = new ArrayList(etot);
      for (int i = 0; i < eread; i++)
      {
          ServerInfo si = Marshal.PtrToStructure(p, typeof(ServerInfo)) as ServerInfo;   
          if (si.majorver > 4 && si.name != "")
            arr.Add(si.name);
          p = (IntPtr)((int)p + size);
      }

      res = NetApiBufferFree(buffer);
      return new StandardValuesCollection(arr);
    }


    public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
    {
      return true;
    }
}

//Sorted list to hold all controls
SortedList ControlListByTabIndex = new SortedList();
			
//Loop over controls
foreach(Control CurrentControl in this.Controls)
{
    //Add to sortedlist, using the tabindex as the key, and the control itself as the value.
    ControlListByTabIndex.Add(CurrentControl.TabIndex, CurrentControl);
}

//You can now loop over the list, and it is ordered by TabIndex
for (int i = 0 ; i < ControlListByTabIndex.Count ; i++)
  {
    Console.WriteLine(((Control)ControlListByTabIndex.GetByIndex(i)).TabIndex);
    Console.WriteLine(((Control)ControlListByTabIndex.GetByIndex(i)).Name);
}