C#

for (int i = 0; i <= 3; i++)
            {
                FormPpal form = new FormPPal();
                form.Show();
            }
            Application.Run();

Form2 f2 = new Form2();
f2.Show();
Form3 f3 = new Form3();
f3.Show();

Form1 f1 = new Form1();
Application.Run(f1);

Application.Run(new Form1());
Form1 f3 = new Form1();
f3.Text = "BAD PROGRAMMING STYLE INCARNATE";
Application.Run(f3);

public static void Main() {
    Application.Run(new Form1());
    Application.Run(new Form2());
}

Shameel wrote:

And if you show all forms using its Show method and call Application.Run() without arguments, the app keeps running in the background even if all the forms are closed (unless, of course, you call Application.Exit())

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
   (sender as Form).Hide(); // don't close the Form, hide it
    e.Cancel = true;
}

public static List<frmPpal> FormsList { get; private set; }
        
        static void Main()
        {

            FormsList = new List<frmPpal>();
            for (int i = 0; i < 8; i++)
            {
                frmPpal form = new frmPpal(new DayTradeFacade());
                FormsList.Add(form);
                form.Show();

            }

            Application.Run();

sink = Whale("baleen");

private void someFunc(string someValue)
{
}

private string someFunc(string someValue)
{
}