//Ham lay danh sach Role
        private List <SelectListItem> GetRoleForView()
        {
            List <SelectListItem> items = new List <SelectListItem>();
            RepositoryOBTRS       db    = new RepositoryOBTRS();
            List <tbl_Role>       role  = db.GetRole();

            for (int i = 0; i < role.Count; i++)
            {
                items.Add(new SelectListItem {
                    Text = role[i].Role_Name, Value = role[i].Role_ID.ToString()
                });
            }
            return(items);
        }