Regarding Update Panel In Ajax

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ASP.NET

Ajax

C#3.5

Hello,

I am devloping One Project in ajax
but i have prpblem like below
please tell me that

how to use edit click button use in ajax and update panel
how i get inside Repeater edit button id in update panel trigger.

Here is my code

<div>
      State :
</div>
<div>
       <asp:Repeater ID="Rpt" runat="server" 
      OnItemDataBound="Rpt_ItemDataBou">
        <HeaderTemplate>
         <table><tr><td>State</td><td> <asp:ImageButton ID="btnedit" ImageUrl="~/Images/Buttons/a2.png" Width="25px" Height="25px"
                                                                                CssClass="btn" Font-Bold="True" runat="server" CommandName="Ed" Text="Edit" ToolTip="Click To Edit Record"
                                                                                OnClick=" btnedit_Click" /></td>
        </HeaderTemplate>
        <itemtemplate>  
        <table><tbody><tr><td align="center"><asp:Literal ID="txtsrno" runat="server"></td></tr></tbody></table>
       <itemtemplate>

</itemtemplate></itemtemplate></tr></table></div>

Regards,Krunal