you can use System.Windows.Forms.Timer.
you can drag it from the toolbar onto the surface of the designer.
, Interval (), Enabled false.
timer Enabled true.
( # - )
private void Form1_Load(object sender, EventArgs e)
{
timer1.Enabled = true;
}
, ,
private void timer1_Tick(object sender, EventArgs e)
{
Close();
}