using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string uidText = "CHE-423.594.340";

        int uidDigits = Int32.Parse(new String(uidText.Where(Char.IsDigit).ToArray()));

        Console.WriteLine("UID convert to int: " + uidDigits);      

        Console.WriteLine("Digits of UID (my version): " + String.Join(",", GetDigits(uidDigits)));

        Console.WriteLine("Digits of UID (w/ Stack): " + String.Join(",", GetDigits2(uidDigits).Reverse()));

        Console.WriteLine("Digits of UID (w/ Linq Reverse): " + String.Join(",", GetDigits3(uidDigits)));

    }

    public static IEnumerable<int> GetDigits(int source)

    {

        int individualFactor = 0;

        int tennerFactor = Convert.ToInt32(Math.Pow(10, source.ToString().Length));

        do

        {

            source -= tennerFactor * individualFactor;

            tennerFactor /= 10;

            individualFactor = source / tennerFactor;

​

            yield return individualFactor;

        } while (tennerFactor > 1);

    }

    public static IEnumerable<int> GetDigits2(int source)

    {

        while (source > 0)

        {

            var digit = source % 10;

            source /= 10;

            yield return digit;

        }

    }

    public static IEnumerable<int> GetDigits3(int source)

    {

        Stack<int> digits = new Stack<int>();

        while (source > 0)

        {

            var digit = source % 10;

            source /= 10;

            digits.Push(digit);

        }

​

        return digits;

    }

}