Easy Reddit Challenge 290

Kaprekar_Numbers.cs

using System;
using System.Collections.Generic;

namespace Kaprekar_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            string line;
            int start, end;
            List<int> KaprekarNumbers = new List<int>();

            Console.WriteLine("Enter Start and End Numbers to test");
            Console.WriteLine("Format like so:");
            Console.WriteLine("<Start> <End>\n");
            line = Console.ReadLine();

            Console.Clear()

            for (start = Convert.ToInt32(line.Substring(0, line.IndexOf(' '))), end = Convert.ToInt32(line.Substring(line.IndexOf(' ') + 1));
                start <= end; start++)
                if (KaprekarTest(start))
                    Console.Write(start + " ");

            Console.WriteLine("");

            Console.ReadKey();
        }

        static bool KaprekarTest(int num)
        {
            string power = Convert.ToInt64(Math.Pow(num, 2)).ToString();

            int num2 = -1;

            if(power.Length % 2 == 0)
                num2 = Convert.ToInt32(power.Substring(0, power.Length / 2)) + Convert.ToInt32(power.Substring(power.Length / 2));
            else if (power.Length > 1)
                num2 = Convert.ToInt32(power.Substring(0, (power.Length - 1) / 2)) + Convert.ToInt32(power.Substring((power.Length - 1) / 2));

            if (num == num2)
                return true;

            return false;
        }
    }
}

For Reddit Easy Challenge 290