CSHARP

c# load form

 
private void Logo_Load(object sender, EventArgs e)
        {
            Login login = new Login();  // my second form is login
            login.ShowDialog();
            this.Close(); // close this form  ( I name it logo form)
        }

c# load form

static class Program {
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        var start = new Form1();
        start.FormClosed += WindowClosed;
        start.Show();
        Application.Run();
    }

    static void WindowClosed(object sender, FormClosedEventArgs e) {
        if (Application.OpenForms.Count == 0) Application.Exit();
        else Application.OpenForms[0].FormClosed += WindowClosed;
    }
}