static void Main(string[] args)
{
int modulo = 97;
string input = Reverse(“100020778788920323232343433″);
int result = 0;
int lastRowValue = 1;

for (int i = 0; i 0)
{
lastRowValue = ModuloByDigits(lastRowValue, modulo);
}
result += lastRowValue * int.Parse(input[i].ToString());
}
result = result % modulo;
Console.WriteLine(string.Format(“Result: {0}”, result));
}

public static int ModuloByDigits(int previousValue, int modulo)
{
// Calculating the modulus of a large number Wikipedia http://en.wikipedia.org/wiki/International_Bank_Account_Number
return ((previousValue * 10) % modulo);
}
public static string Reverse(string input)
{
char[] arr = input.ToCharArray();
Array.Reverse(arr);
return new string(arr);