void BusyHide()
 {
     if (bFrm == null)
     {
         return;
     }
     bFrm.Close();
     bFrm = null;
 }
 void BusyHide()
 {
     if (_bFrm == null)
     {
         return;
     }
     _bFrm.Close();
     _bFrm = null;
 }