private void butDelete_Click(object sender, EventArgs e)
 {
     if (IsNew)
     {
         DialogResult = DialogResult.Cancel;
         return;
     }
     if (MessageBox.Show("Delete?", "Delete?", MessageBoxButtons.OKCancel) == DialogResult.Cancel)
     {
         return;
     }
     try {
         MedicalOrders.Delete(MedOrderCur.MedicalOrderNum);
     }
     catch (Exception ex) {
         MessageBox.Show(ex.Message);
         return;
     }
     DialogResult = DialogResult.OK;
 }