private void btStartServer_Click(object sender, EventArgs e)
{
if(server==null)
server = new Server(listenPort, sendPort, nbrPacketToSend, nbrPacket, sendBroadcastPort, calculatorClass, cuttingClass);
server.startServer();
server.OnUpdateClient += new Server.UpdateClient(server_OnUpdateClient);
server.OnDisplayFractal += new Server.displayFractal(server_OnDisplayFractal);
server.OnUpdateResult += new Server.UpdateResult(server_OnUpdateResult);
server.OnUpdateWorkInfo += new Server.UpdateWorkInfo(server_OnUpdateWorkInfo);
}