Grid Not gets Refresh on Delete

I've a Gridview with buttonfield 'Delete' When I Delete some data then Grid gets refresh but not on last record.   Here is my Complete Code.
HTML :
<asp:Panel ID="Panel1" runat ="server">                                                 <asp:UpdatePanel ID="UpdatePanel3" runat="server">                         <ContentTemplate>                                 <asp:GridView ID=&qu ...