Display the sum of digit of the number

Ques: Write a C# program to display the sum of digit of the number entered by User 

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n, sum = 0, m;
            Console.Write("Enter a Number");
            n = int.Parse(Console.ReadLine());
            while(n>0)
            {
                m = n % 10;
                sum = sum + m;
                n = n / 10;
            }
            Console.Write("Sum  = " + sum);
            Console.ReadKey();
        }
    }
}

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