Changing link button text in grid view

Question

i have a grid view
in grid view i have a link button with text OK .
<ItemTemplate>
  <asp:LinkButton ID="lnk_sts" runat="server" Enabled="true" Text="OK"
  onclick="lnk_sts_Click"></asp:LinkButton>
 </ItemTemplate>
i want that for each row when ok is clicked then that particular row link button text should change to done.
how can i do this