public JsonResult ListDataTablesAjax(Int32 departmentId = 0)
        {
            DataTablesRequest  dtRequest;
            DataTablesResponse dtResponse;

            dtRequest  = GetDataTablesRequest();
            dtResponse = um.ListDataTablesAjax(dtRequest, departmentId);

            return(Json(dtResponse, JsonRequestBehavior.DenyGet));
        }