Calculating Armstrong upto a limit

using System;
using System.Collections.Generic;

static class Program
{
    public static void Main()
    {
        List<int> armstrongList = Armstrong.ArmstrongEvenNumbers();

        foreach (int val in armstrongList)
        {
            Console.WriteLine(val);
        }
    }
}

class Armstrong
{
    public static List<int> ArmstrongEvenNumbers()
    {
        List<int> armstrongList = new List<int>();
        for (int i = 0; i < int.MaxValue; i++)
        {
            int digits = 0;
            double armsValue = 0;
            int tempStore = i;
            int tempDigits = i;
            while (i > 0)
            {
                while (tempDigits != 0)
                {
                    digits++;
                    tempDigits = tempDigits / 10;
                }
                int remainder = i % 10;
                armsValue = armsValue + Math.Pow(remainder, digits);
                i = i / 10;
            }
            if (armsValue == tempStore)
                armstrongList.Add(tempStore);
            if (armstrongList.Count == 20)
                break;
            i = tempStore;
        }
        return armstrongList;
    }
}