Enabling browser back button for GridView Paging and Sorting in Ajax

Enabling browser back button for GridView Paging and Sorting in Ajax 1.1 and 3.5 (using Visual Studio 2005/ Visual studio 2008) Generally we use browser back button frequently to go to back/previous page importantly its useful when we are searching using search controls (Textbox's, dropdowns, button..), or using Paging, Sorting etc. In all these case when there is a post back, the browser is updated with the information of the page visited and hence the back button gets enabled automatically. However if we are updating page using AJAX asynchronous requests, updating browser history is not taken care automatically.......