private void OpenChatWindow()
{
if (this._chatWindow == null)
{
this._chatWindow = new ChatForm(this,this._stream);
this._chatWindow.FormClosed += ChatWindowClosed;
this._chatWindow.Show();
}
else this._chatWindow.Focus();
}
void ChatWindowClosed(object sender, FormClosedEventArgs e)
{
this._chatWindow = null;
}