Sum Of The String Value In C#

using System;
using System.Net.NetworkInformation;
using System.Net;
using System.Net.Sockets;
namespace Example
{

    class Program
    {
        static void Main(string[] args)
        {
            string num = "10,20,30,40";
            string[] val = num.Split(',');
            int sum = 0;
            int temp = 0;
            for (int i = 0; i < val.Length; i++)
            {
                sum += int.Parse(val[i]);

            }
            Console.Write(sum);
            Console.Read();

        }
    }
}