HOW TO make columns in an ASP.NET GridView sortable with jQuery

• Use the jQuery Tablesorter Plugin - see article with demo 
• Note that the jQuery Tablesorter Plugin requires the table generated by the GridView to have thead and tbody tags
• Assuming the Id of the GridView server control is set to grdEmployee, you can access the dynamically generated table's ID and build the selector like this -

         gridId = $("table[id$='grdEmployee']").attr("id");
         $('#' + gridid).tablesorter(); 

• If you have a checkbox in the column header to implement Select All/De-select All functionality for items in that GridView, that will fail as the Tablesorter plugin will override the click event. To overcome that, use this trick -

         $("#tablesorter").tablesorter({headers:{0:{sorter:false}}}); 


Also see:
Yours declaratively, GridView 
Beware of breaking changes in jQuery library versions