VideoCallServer.User.GetHearBeat C# (CSharp) Méthode

        public bool GetHearBeat()
        {
            return _bHearBeat;
        }

 public void RemoveUserDead()
 {
     try
     {
         if (!lstUsers.InvokeRequired)
         {
             int i;
             for (i = 0; i < _listUsr.Count; i++)
             {
                 User tmp = (User)_listUsr[i];
                 if (tmp.GetIEPConvVideo() == null && tmp.GetIEPConvAudio() == null)
                 {
                     if (!tmp.GetHearBeat())
                     {
                         lstUsers.Items.Remove(tmp.GetUser());
                         _listUsr.Remove(tmp);
                         tmp = null;
                     }
                     else
                     {
                         tmp.SetHearBeat(false);
                     }
                 }
             }
         }
         else
         {
             RemoveUserDeadCallback d = new RemoveUserDeadCallback(RemoveUserDead);
             Invoke(d, new object[] {  });
         }
     }
     catch (Exception)
     {
     }
 }