private void btn_Delete_Click(object sender, EventArgs e)
 {
     if (cbx_VisitName.SelectedIndex != -1)
     {
         _SelectedVisitType.VisitTypeName = cbx_VisitName.Text;
         string _message = visitType.deleteBDVisitType(_SelectedVisitType);
         FillVisitTypeCombo();
         MessageBox.Show(_message);
     }
     else
     {
         MessageBox.Show("برجاء اختيار بيانات للحذف");
     }
 }