====== t foot and thead in gridview ======
<code csharp>
        private void MakeAccessible(GridView grid)
        {
            if (grid.Rows.Count > 0)
            {
                //This replaces <td> with <th> and adds the scope attribute
                grid.UseAccessibleHeader = true;

                //This will add the <thead> and <tbody> elements
                grid.HeaderRow.TableSection = TableRowSection.TableHeader;

                //This adds the <tfoot> element. Remove if you don't have a footer row
                grid.FooterRow.TableSection = TableRowSection.TableFooter;
            }
        }
</code>