jquery simple modal + asp.net

I have a jquery simple modal with a textbox and linkbutton on when the link button click event is fired and I try to get the textbox's value in the code behind it is empty

Any ideas?

You should make sure that the modal window is appending inside form tag instead of the body tag.

http://www.ericmmartin.com/projects/simplemodal/#options

• appendTo [String:'body']

The jQuery selector to append the elements to. For ASP.NET, use 'form'.