public static void AddKnownNXT(List<KnownNXT> list, KnownNXT knownNXT)
     {
     foreach (KnownNXT existing in list)
         {
         if (existing.Equals(knownNXT))
             return;
         }
     list.Add(knownNXT);
     }
 public static int Compare(KnownNXT left, KnownNXT right)
     {
     return String.Compare(left.NxtName, right.NxtName);
     }
 private void comboBoxNXTSelection_SelectedIndexCommitted(object sender, EventArgs e)
 {
     if (this.currentNXT != null)
         {
         if (this.currentNXT != this.SelectedNXT)
             {
             this.currentNXT.Stop();
             this.currentNXT = null;
             }
         }
     UpdateEnabledState();
 }