Program to generate perfect number within given range

using System;
namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            int l, h, d, s;
            Console.Write("\n Enter the low range : ");
            l = int.Parse(Console.ReadLine());
            Console.Write("\n Enter the high range : ");
            h = int.Parse(Console.ReadLine());
            Console.Write("\n The perfect numbers are : ");
            while (l <= h)
            {
                s = 0;
                d = 1;
                while (d < l)
                {
                    if (l % d == 0)
                    {
                        s = s + d;
                        d = d + 1;
                    }
                    else
                        d = d + 1;
                }
                if (l == s)
                    Console.Write("  " + l);
                l++;
            }
            Console.ReadLine();
        }
    }
}


                                                      Output