Program Suma - dodawanie dw�ch 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();
}
}
}