want to remove border from bottom row in Gridview?

hi,
I have set a bottom border for each row in Gridview using CSS class below

  <style type="text/css">         .gridLines td         {             border-bottom: 1px solid Gray;             border-bottom-color: #999966;                     }     </style>

<asp:GridView ID="GridView2" runat="server" CssClass="gridLines"
   
Now I want to hide the very last bottom border in the last row of the  gridview.

Thank you for any tips?