private void Server_ClientDisconnected(object sender, ClientDisconnectedEventArgs e)
{
lblClients.Invoke((MethodInvoker)(() => lblClients.Text = $"Clients connected: {server.NumberOfConnectedClients}"));
this.Invoke((MethodInvoker)(() => clientlog.TxtClients($"Disconnected: {e.Client.ToString()}")));
}