break point not hit in page_load

Hi ,

I have a Page named default.aspx and i have a Page Load and Button click event in the default.aspx.cs , iam using asp.net 2.0
The page is being displayed on browser, but when i set a breakpoint in Page_Load it is not getting hit when the page is loaded for the first time , after the page being displayed on the browser , i click the button which hits the breakpoint , why is it not getting hit the first time the page is being loaded