public void FillVisitTypeCombo()
 {
     cbx_VisitName.DataSource    = visitType.SelectAllBDVisitType();
     cbx_VisitName.DisplayMember = "VisitTypeName";
     cbx_VisitName.ValueMember   = "VisitTypeID";
     cbx_VisitName.SelectedIndex = -1;
     cbx_VisitName_SelectedIndexChanged(cbx_VisitName, new EventArgs());
 }
 /// <summary>
 /// fill dropdown with visit type names with id as a selected value
 /// </summary>
 private void fillDrobdown()
 {
     try
     {
         cbx_VisitTypeName.DataSource    = newObjVisitType.SelectAllBDVisitType().ToList();
         cbx_VisitTypeName.DisplayMember = "VisitTypeName";
         cbx_VisitTypeName.ValueMember   = "VisitTypeID";
     }
     catch (Exception ex)
     {
         throw;
     }
 }