Project Euler problem 5

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Algo1
{
    internal class Program
    {
       public static void Main(string[] args)
        {

         //   Stopwatch stopwatch = Stopwatch.StartNew(); 
         //   stopwatch.Start();
            int maxnum = 20;
            int num = 2;
            for (int i = num; i <= int.MaxValue; i += 2)
            {
                int tmp = GetNum(i, maxnum);
                if ( tmp!= 0)
                {
                    num = tmp;
                    break;
                }
               
            }
          //  stopwatch.Stop();
            Console.WriteLine("The Number : "+num);
         //   Console.WriteLine("Time in Milliseconds : "+stopwatch.ElapsedMilliseconds);
            Console.ReadKey();
        }

        public static int GetNum (int num,int maxnum)
        {
            for (var i = 2; i <= maxnum; i++)
            {

                if (num % i != 0)
                {

                    return 0;

                }
                if (i == maxnum)
                {
                    return num;
                }
            }
            return 0;
        }
    } 
}