private void LoadDataToDepartment()
 {
     if (trDepartment.Nodes.Count > 0)
         trDepartment.Nodes.Clear();
     cls_DepartmentInformation objDe = new cls_DepartmentInformation();
     dtDepartment = objDe.GetList();
     ShowDSTreeview(trDepartment, dtDepartment, 0, "Id", "Name", "Belong_DepartmentId","Toàn bộ phòng ban");
     trDepartment.ExpandAllNodes();
 }