Listing F
private void btnDoPrimeThing_Click(object sender, System.EventArgs e) {
   Class1 class1 = new Class1();
   class1.OnPrime += new Class1.OnPrimeEventHandler (this.Class1_OnPrime);
   for (long i=1; i <= 100; i++){
      class1.IsPrime (i);
   }
}