C# Timer

namespace StakeCamp
{
    public partial class startPage : Form
    {
        public startPage()
        {
            InitializeComponent();
 
            Timer timer = new Timer();
            timer.Interval = 3000;
            timer.Tick += new EventHandler(OnTick);
            timer.Enabled = true;
            timer.Start();
            //timer.Stop();
        }
 
        public void OnTick(object s, EventArgs ea)
        {
            mainMenu mMenu = new mainMenu();
            this.Hide();
            mMenu.Show();
            mMenu.Top = this.Top;
            mMenu.Left = this.Left;
            
        }
        
    }
}