How to add an event to a class

public event EventHandler Jump;
public void OnJump()
{
    EventHandler handler = Jump;
    if (null != handler) handler(this, EventArgs.Empty);
}

then

Frog frog = new Frog();
frog.Jump += new EventHandler(yourMethod);

private void yourMethod(object s, EventArgs e)
{
     Console.WriteLine("Frog has Jumped!");
}