/// <summary>
        /// Validate IR National Code
        /// </summary>
        /// <param name="nationalcode">National Code</param>
        /// <returns></returns>
        public static bool IsValidNationalCode(this string nationalcode)
        {
            int last;
            return nationalcode.IsValidNationalCode(out last);
        }

        /// <summary>
        /// Validate IR National Code
        /// </summary>
        /// <param name="nationalcode">National Code</param>
        /// <param name="lastNumber">Last Number Of National Code</param>
        /// <returns></returns>
        public static bool IsValidNationalCode(this string nationalcode, out int lastNumber)
        {
            lastNumber = -1;
            if (!nationalcode.IsItNumber()) return false; 
            var array = nationalcode.ToCharArray();
            if (array.Length != 10) return false;
            var j = 10;
            var sum = 0;
            for (var i = 0; i < array.Length - 1; i++)
            {
                sum += Int32.Parse(array[i].ToString(CultureInfo.InvariantCulture)) * j;
                j--;
            }
            var div = sum / 11;
            var r = div * 11;
            var diff = Math.Abs(sum - r);

            if (diff <= 2)
            {
                lastNumber = diff;
                return diff == Int32.Parse(array[9].ToString(CultureInfo.InvariantCulture));
            }
            var temp = Math.Abs(diff - 11);
            lastNumber = temp;
            return temp == Int32.Parse(array[9].ToString(CultureInfo.InvariantCulture));
        }

bool b = "0077611616".IsValidNationalCode();