C# - Get Source of a HTML Page

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;
// Included System.Net Class
using System.Net;
namespace getsauce
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            // Create a new webclient
            System.Net.WebClient newClient = new System.Net.WebClient();
            newClient.Proxy = null;
            // Check if textbox1 contains 'http://' <- is required
            if (textBox1.Text.Contains("http://"))
            {
                // Create new variable, which downloads the website source
                string getsauce = newClient.DownloadString(textBox1.Text);
                // Put downloaded source into textbox
                textBox2.Text = getsauce.ToString();
            }
            // Else we'll add then download source
            else
            {
                // Add 'http://' then download page source, and put in textbox
                textBox1.Text = "http://" + textBox1.Text;
                // Download source
                string getsauce = newClient.DownloadString(textBox1.Text);
                // Display source into textbox
                textBox2.Text = getsauce.ToString();
            }
        }
    }
}