I'm copying this and the reply from the WebGrid forum.  I accidentally posted it there before I realized the old UltraWebGrid had been renamed to "WebGrid".

What is the WebDataGrid equivalent of

UltraWebGrid1.DisplayLayout.SelectedRows.Clear();

 ?

 Basically I have a grid that shows search results and am finding that things like the current page and selected row persist when I reset the data source after a new search, which I don't really want. 

Here's where the code would go (this is in page load):

          if (newSearch)
            {
                gridSearch.Behaviors.Paging.PageIndex = 0;

               //HELP!  Need to deselect any selected rows.              
            }

Alex K. answered in the other forum with:

    Hi John,

    WebDataGrid has its own forum. Please post firther questions there. Thanks!

    Have you tried clearing the selectedrows collection off the Selection
    behavior?

    gridSearch.Behaviors.Selection.SelectedRows.Clear();

 That looked promising but did not work for me.  Even if I put this line at the top of page_load with no conditions, the previously selected row does not clear when I rebind the data source/reload the page.  Maybe it's somehow staying persisted on the client? 

 Any ideas?