Sum Digit of User given Number

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Sumofgvenumber
{
    class Program
    {
        static void Main(string[] args)
        {
            int numbr;
            int sum = 0;
            int l;
            Console.WriteLine("Please enter Number which you want to add");
            numbr = Convert.ToInt32(Console.ReadLine());
            while(numbr != 0)
            {
                l = numbr % 10;
                numbr = numbr / 10;
                sum = sum + l;
            }
            Console.WriteLine(" Sum of Number is" + sum);
            Console.ReadLine();
        }
    }
}