private void btnConnect_Click(object sender, EventArgs e) { if (txtIP1.Text == "" || txtIP2.Text == "") { return; } string serverIP1 = txtIP1.Text; string serverIP2 = txtIP2.Text; string clientIP = "127.0.0.1"; if (clientCalc1 == null) { clientCalc1 = new TClient(GetDataArrived1); } clientCalc1.ClientBeginConnect(serverIP1, 5000, clientIP); if (clientCalc2 == null) { clientCalc2 = new TClient(GetDataArrived2); } clientCalc2.ClientBeginConnect(serverIP2, 5001, clientIP); }