SG codigo 1

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SG___Code_1
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = 0;
            int b = 0;
            if (args.Length == 2)
            {
                try
                {
                    a = Convert.ToInt32(args[0]);
                }
                catch (Exception e)
                {
                    System.Console.WriteLine("Error en el primer parametro.");
                    System.Console.WriteLine("El programa recibe dos parametros enteros, ejemplo sgc1 1980 2012");
                    Environment.Exit(0);
                }

                try
                {
                    b = Convert.ToInt32(args[1]);
                }
                catch (Exception e)
                {
                    System.Console.WriteLine("Error en el segundo parametro.");
                    System.Console.WriteLine("El programa recibe dos parametros enteros, ejemplo sgc1 1980 2012");
                    Environment.Exit(0);
                }
                for (int i = a; i <= b; i++)
                {
                    char[] c = i.ToString().ToCharArray();
                    if (c[0] != c[1] && c[0] != c[2] && c[0] != c[3] &&
                        c[1] != c[2] && c[1] != c[3] &&
                        c[2] != c[3])
                    {
                        System.Console.WriteLine(i);
                    }
                }
            }
            else
            {
                System.Console.WriteLine("El programa recibe dos parametros enteros, ejemplo sgc1 1980 2012");
            }
        }
    }
}