showModalDialog and postbacks in ASP.NET

I learned something new today that window.showModalDialog to open a modal window on the client from parent page using javascript, but whenever that page does a postback, it would open up a new window. A normal window.open works fine, this is the problem only with modal window.

Finally I found a solution which is very simple by just including the below tag in the section of the modal Window.

<base target="”_self”/">

And also we need to set the output cache property to “1″ otherwise next time when you try to open the modal window, it will take it from cache.

<%@ OutputCache Duration=”1″ VaryByParam=”none”%>

Enjoy..