[C#] TinyURL Generator

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;
using System.Net;

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

        private void button1_Click(object sender, EventArgs e)
        {
            System.Net.WebClient a = new System.Net.WebClient();
            string b = a.DownloadString("http://tinyurl.com/api-create.php?url=" + textBox1.Text);
            textBox2.Text = b.ToString();
        }
    }
}

        Dim a As New System.Net.WebClient
        Dim b As String = a.DownloadString("http://tinyurl.com/api-create.php?url=" & TextBox1.Text)
        TextBox2.Text = b.ToString