private void Application_Startup(object sender, StartupEventArgs e) { startupArgs = e.Args; // Create the startup window MainWindow mainWnd = new MainWindow(); if (e.Args.Length >= 1) { bool openSucc = mainWnd.OpenFile(e.Args[0]); } if (e.Args.Length >= 3) { mainWnd.Width = Convert.ToDouble(e.Args[1]); mainWnd.Height = Convert.ToDouble(e.Args[2]); } // Show the window mainWnd.Show(); HelloWorld hwWnd = new HelloWorld(); hwWnd.Show(); ButtonClick btnClickWnd = new ButtonClick(); btnClickWnd.Show(); }