Adding Web page to iFrame when a web user control event fires

i am new to aspx programming, I have a web page say default.aspx, and i am using two web user control on the page namely usercontrol1 and usercontrol2 now i am having an i frame on default page. I am having buttons on usercontrol2 which on the click opens up a page namely default2.aspx. it works fine. the problem is that i want to open def开发者_StackOverflow社区ault2 page inside default page's iframe when the button click event is fired from usercontrol2 buttons. thanks in advance reema

You must write javascript for this situation. And call this function button's onClientClick event.