private void sendButton_Click(object sender, EventArgs e) { string message = messageTextBox.Text.ToString(); messageTextBox.Clear(); if (message.StartsWith("private to")) { int i = message.IndexOf(':'); string text = message.Substring(i + 1); controller.OnSendPrivateMessageButton(text, privateReceiver); } else { controller.OnSendMessageButton(message); } messageTextBox.Focus(); }