public static string CurrentKhachhangUsername

        {

            get

            {

                HttpRequest request = HttpContext.Current.Request;

                if (request.Cookies[".khachhangshj"] == null)

                {

                    return string.Empty;

                }

                return request.Cookies[".khachhangshj"].Value;

            }

            set

            {

                HttpCookie cookie = new HttpCookie(".khachhangshj");

                cookie.Expires = DateTime.Now.AddYears(1);

                cookie.Value = value;

                HttpContext.Current.Response.Cookies.Add(cookie);

            }

        }