/// <summary>
        /// Kiểm tra xe nghỉ
        /// </summary>
        /// <param name="privateCodes">The private codes.</param>
        /// <returns></returns>
        /// <Modified>
        /// Name     Date         Comments
        /// LuanBH  8/28/2015   created
        /// </Modified>
        public static string CheckRestingVehicle(string privateCodes)
        {
            var restingVehicles = CuocGoi.EnVangVip_sp_GetRestingVehicle(privateCodes);

            if (!string.IsNullOrEmpty(restingVehicles))
            {
                return(string.Format("{0} đang không hoạt động. Xin chọn xe khác.", restingVehicles));
            }
            return(string.Empty);
        }