Scratch

using System.Net;
using System.Web;
using System.IO;

private void tweetButton_Click(object sender, EventArgs e)
{

}

public Form1()
{
        InitializeComponent();
}

        /// <summary>
        /// Post an update to a Twitter acount
        /// </summary>
        /// <param name="username">The username of the account</param>
        /// <param name="password">The password of the account</param>
        /// <param name="tweet">The status to post</param>
        public static void PostTweet(string username, string password, string tweet)
        {
            try
            {
                // encode the username/password
                string user = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(username + ":" + password));
                // determine what we want to upload as a status
                byte[] bytes = System.Text.Encoding.ASCII.GetBytes("status=" + tweet);
                // connect with the update page
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://twitter.com/statuses/update.xml");
                // set the method to POST
                request.Method = "POST";
                request.ServicePoint.Expect100Continue = false;
                // set the authorisation levels
                request.Headers.Add("Authorization", "Basic " + user);
                request.ContentType = "application/x-www-form-urlencoded";
                // set the length of the content
                request.ContentLength = bytes.Length;
                // set up the stream
                Stream reqStream = request.GetRequestStream();
                // write to the stream
                reqStream.Write(bytes, 0, bytes.Length);
                // close the stream
                reqStream.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("An error occured when posting your tweet.\n\nError: " + ex.Message);
            }
        }

private void tweetButton_Click(object sender, EventArgs e)
{

}

private void tweetButton_Click(object sender, EventArgs e)
{
        PostTweet(usernameBox.Text, passwordBox.Text, tweetBox.Text);
}