Program Suma - dodawanie dwóch liczb



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

namespace Suma
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double a, b, c;
            double.TryParse(textBox1.Text, out a);
            double.TryParse(textBox2.Text, out b);
            c = a + b;
            textBox3.Text = c.ToString();

        }
    }
}