Question

I have a form on ASP .NET page, with button onclick event attached to doPostBack function.
However when I click that button form gets submitted twice. Server side debugger enters Page_Load twice, Fiddler records two aspx requests etc, there are no 302 redirects etc, it’s pretty straightforward page.

When I set breakpoint in __doPostBack function it’s also called once (perhaps it’s just an illusion).

Is there a chance to debug client side even more deeper to find the issue?

Thanks, Paweł

Answer 1

Ok. got it: input type=”image” had

onclick="__doPostBack(.....)" 

When I modified it to:

onclick="_doPostBack(...); return false;"

and two requests issue went away. Only one request was recorded by Fiddler, Page_Load is called once and everything is neat.

So be careful when using HTML elements that cause automatic form submission on click 😉

Thanks, Paweł