private void timer1_Tick(object sender, EventArgs e)
{
var rooms = _chatClient.GetRooms();
var index = -1;
if (!string.IsNullOrEmpty(Room))
{
index = listBox1.SelectedIndex;
}
listBox1.Items.Clear();
listBox1.Items.AddRange(rooms.Select(r => r.Name).ToArray());
listBox1.SelectedIndex = index;
if (!string.IsNullOrEmpty(Room))
{
var messages = _chatClient.GetMessages(Room);
richTextBox1.Clear();
var messagesText = string.Join(Environment.NewLine, messages
.Select(t => $"{t.Time} [{t.Sender}]: {t.Text}")
.ToArray());
richTextBox1.Text = messagesText;
}
}