How to validate iranian Melli Code (National Code or Code Melli) in android

Question

I need a method to validate the Melli Code (National Code or Code Melli) of iranian people.

I Know it has a formula.

Answer 1

First, use the System.Text.RegularExpressions class and then use this script:.

#region NationalCode Check

public bool NationalCodeCheck(string input)
{
    if (!Regex.IsMatch(input, @"^\d{10}$"))
        return false;

    var check = Convert.ToInt32(input.Substring(9, 1));
    var sum = Enumerable.Range(0, 9)
            .Select(x => Convert.ToInt32(input.Substring(x, 1)) * (10 - x))
            .Sum() % 11;

    return (sum < 2 && check == sum) || (sum >= 2 && check + sum == 11);
}

#endregion