/// <summary>
        /// tra ve dia chi cua so dien thoai
        /// </summary>
        /// <param name="PhoneNumber"></param>
        /// <returns></returns>
        public static string  GetDanhBa(string PhoneNumber)
        {
            if (!DanhBa.IsDienThoaiDiDong(PhoneNumber))
            {
                if (DanhBa.IsDienThoaiCoDinh(PhoneNumber))
                {
                    DataTable dt = new DataTable();

                    dt = new Data.DanhBa().GetDanhBa(PhoneNumber.Substring(PhoneNumber.Length - 8, 8));
                    string strDiaChi = "";
                    if (dt.Rows.Count > 0) // Co dia chi
                    {
                        strDiaChi = string.Format("[{0}]{1}", MaHoaDuLieu.GiaiMa(dt.Rows[0]["Name"].ToString()), MaHoaDuLieu.GiaiMa(dt.Rows[0]["Address"].ToString()));
                    }
                    dt.Dispose();
                    dt = null;

                    return(strDiaChi);
                }
            }
            return(string.Empty);
        }
        /// <summary>
        /// tra ve so dient hoai toi thieu
        ///  input : 0437856099,0905228313,01689581628
        ///  output: 37856099,905228313,1689581628
        ///
        /// </summary>
        /// <param name="PhoneNumber"></param>
        /// <returns></returns>
        public static string GetSoDienThoaiToiThieu(string PhoneNumber)
        {
            if (PhoneNumber.Length <= 8)
            {
                return(PhoneNumber);
            }

            if (DanhBa.IsDienThoaiCoDinh(PhoneNumber))
            {
                if (PhoneNumber.Length > 8)
                {
                    return(PhoneNumber.Substring(PhoneNumber.Length - 8, 8));
                }
            }
            if (DanhBa.IsDienThoaiDiDong(PhoneNumber))
            {
                if (PhoneNumber.Substring(0, 1) == "0")
                {
                    return(PhoneNumber.Substring(1, PhoneNumber.Length - 1));
                }
            }

            return(PhoneNumber);
        }