How to achieve parent - child screen in asp.net

Hi All,

I have created one aspx page, which has Ajax Updatepanel in it. I have place 1 link button and 1 GridView in this page.

When link button is clicked, it opens another page where i enter inputs for GridView and one Add button is placed in this page.

When button is clicked, i run into javascript error which is as below:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.

Details: Error parsing near '<script language='ja'.