Hi Tahir,

Similar is possible to implement. Application may create a hidden field which will store page index. On load from server (initial or full postback), that field should be empty. When page-index is changed, then that field should be updated with that value. On initialization grid may check value in that field and if it is not empty, then it means that the "back" feature of browser (or "back" from redirected page) from  was used. So, value is hidden field can be used to restore state of grid before redirect. Below is example:

<script type="text/javascript">
function initGrid(grid, args)
{
 doBackState(grid, false);
}
function pageChanged(grid, args)
{
 doBackState(grid, true);
}
function doBackState(grid, save)
{
 var paging = grid.get_behaviors().getBehaviorByName('Paging');
 var backState = $get('gridBackStateInput');
 if(!paging || !backState)
  return;
 if(save)
 {
  backState.value = paging.get_pageIndex();
  return;
 }
 var index = backState.value;
 if(index && index.length > 0)
  paging.set_pageIndex(parseInt(index));
}
</script>

  <input type="hidden" id="gridBackStateInput" />
  <ig:WebDataGrid ID="WebDataGrid1" runat="server" ... >
       <ClientEvents Initialize="initGrid" />
       <Behaviors>
           <ig:Paging>
              <PagingClientEvents PageIndexChanged="pageChanged" />
           </ig:Paging>
         </Behaviors>
   ...

You are correct, there is no clean way to determine whether the page is loaded via back button or it has been refreshed.

If you would, please contact developer support and file a feature request. Thank you.