Please help to Delete the records in gridview

<itemtemplate>
   <asp:LinkButton ID="glnkDelete" runat="server" Text="Delete"
       Width="100%" OnClick="glnkDelete_Click"
       OnClientClick="return confirm('Are you certain you want to delete this reimbursement entry');" >

</itemtemplate>

   protected void glnkDelete_Click(object sender, EventArgs e)
{
    LinkButton glnkDelete = sender as LinkButton;
    GridViewRow row = (GridViewRow)glnkDelete.NamingContainer;
    string claimNo = row.Cells[5].Text.Trim();
    // You code for deletion here...
    // ....
    // upGridClaims.Update();   sample update you grid...
}