private void SetLaunchable(bool CanLaunch) { if (this.button1.InvokeRequired) { SetLaunchableCallback d = new SetLaunchableCallback(SetLaunchable); this.Invoke(d, new object[] { CanLaunch }); } else { this.button1.Enabled = CanLaunch; this.button3.Enabled = CanLaunch; } }