private void Button_Click(object sender, RoutedEventArgs e) { string email = emailTextBox.Text; string pass = passwordTextBox.Text; client.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8000)); var stream = client.GetStream(); var json = JsonConvert.SerializeObject(new { email = email, pass = pass }); var arr = Helper.StringToBytes(json); stream.Write(arr, 0, arr.Length); exp.IsExpanded = true; }