I have a web form in asp.net which holds a close button. I need to know that if there is any way that I can force the user to only close the window through that close button. Behind the button I have called java script "window.close();" after some of my own stuff. My problem is that the user can also close the window through the right top "X" button of browser. Is there any way I can disable or somehow make it non-working? That way I will be sure that the page is always closed through close button provided on the page. Any help will be appreciated.