public partial class Form2 : Form
    {
        public static System.Timers.Timer timer1;
        public Form2()
        {
            InitializeComponent();
            timer1 = new System.Timers.Timer(1000);
            timer1.Elapsed += new System.Timers.ElapsedEventHandler(OnTimedEvent);
            timer1.Interval = 2000;
            timer1.Enabled = true;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            pictureBox1.Show();
            timer1.Start();

        }
        public void OnTimedEvent(object source, System.Timers.ElapsedEventArgs e)
        {
            pictureBox1.Hide();
        }
    }