In ASP.Net projects I have come across numerous time that you need to position the the page at certain vertical location on PostBack. For example you might have multiple long Panels or grids that when clicked need to post back the data to the server and return to certain other panel or Grid on the Page. SmartNavigation feature of ASP.Net allows you to keep the last click position on post back but does not allow the positioning of the page to any other desired location.
//Script for Bookmark Positioning
StringBuilder Script = new StringBuilder();
RegisterClientScriptBlock ("BookMarkScript", Script.ToString());
This will result in the page being position where the bookmark tag is placed on he page.