Find Sum of Digits of a Number

In this blog we will know how to find sum of digits of a number. 

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms; 

namespace Find_sum_of_digits_of_a_number
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        } 
        private void button1_Click(object sender, EventArgs e)
        {
            int sum = 0;
            int num1 = int.Parse(textBox1.Text);
            int num2 = num1;
            while (num2 > 0)
            {
                sum += (num2 % 10);
                num2 /= 10;
            }
            MessageBox.Show("Total sum of the digits is:"+sum.ToString());
        }
    }
}