void btn_Send_Click(object sender, RoutedEventArgs e)
{
if (txbMessage.Text != string.Empty)
{
Server.SendtoAll(txbMessage.Text, tb_Name.Text);
TakeMessage_sent(txbMessage.Text, "You");
txbMessage.Clear();
sc_chatbox.ScrollToBottom();
list_User.Children.Clear();
LoadUserList(Server.GetCurrrentUserList());
}
}