Count the specified digit occurrence between 0 and the given number

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Diagnostics;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(CountDigitOccurrence(1000000, 2));
        }

        public static int CountDigitOccurrence(int number, int digit)
        {
            int count = 0;
            for (int i = 0; i <= Math.Abs(number); i++)
            {
                for(int j = 0; j < i.ToString().Length; j++)
                {
                    if(i.ToString()[j] == digit.ToString()[0])
                    {
                        count++;
                    }
                }
            }
            return count;
        }
    }
}

Output
=======
600000
Press any key to continue . . .
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