Nkkppp Page_Init Event Occurs Twice but the message is printed only once ...Y?

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ASP.NET

In the below code..

1) when i run the below code Page_init event occurs once and the message is printed.
2) when the button is clicked again the page life cycle starts so the page is iniatised but the message within Page_init event is not printed....Y??

namespace eventdemo
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
lblmessage.Text += "Page load event handled. <br />";
if (Page.IsPostBack)
{
lblmessage.Text += "Page post back event handled.<br/>";
}
}
protected void Page_Init(object sender, EventArgs e)
{
lblmessage.Text += "Page initialization event handled.<br/>";
}
protected void Page_PreRender(object sender, EventArgs e)
{
lblmessage.Text += "Page prerender event handled. <br/>";
}
protected void btnclick_Click(object sender, EventArgs e)
{
lblmessage.Text += "Button click event handled. <br/>";
}
}
}