ASP.NET

<asp:ImageButton ID="imb_EditDetail" runat="server" AlternateText="Update Receipt" ImageUrl="edit.gif" OnClick="Update_TicketDetail" />
                                                        
<ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server" 
TargetControlID="imgEditDetail"
PopupControlID="pnl_EditQty"
BackgroundCssClass="modalBackground"
DropShadow="true"
OnOkScript="ok()"
CancelControlID="Btn_CancelEdit" />

<asp:Panel ID="pnl_EditQty" runat="server" CssClass="modalBox" Style="display: none;" Width="300">
<asp:Panel HorizontalAlign="Center" ID="Panel2" runat="server" >Edit Quantity</asp:Panel>
            		
<asp:Label ID="lbl_Name" runat="server"></asp:Label><
<asp:TextBox ID="txt_qty" runat="server" ></asp:TextBox>

<asp:Button ID="Btn_Edit" runat="server" Text="Edit" Width="55px" OnClick="Btn_Edit_Item_Click"  CausesValidation="true" Itm_idx="" ticket_idx="" history_idx="" old_qty="" Control_id="" />
<asp:Button ID="Btn_CancelEdit" runat="server" Text="Cancel" Width="55px" buttonAction="submitButton" />
		                                                            	
</asp:Panel>

    protected void Btn_Edit_Item_Click(object source, EventArgs e)
    {
        
        string id = ((Button)source).CommandArgument.ToString();
        string idx = ((Button)source).Attributes["Itm_idx"].ToString();
        string ticket_idx = ((Button)source).Attributes["ticket_id"].ToString();
        string history_idx = ((Button)source).Attributes["history_id"].ToString();
        string oldQty = ((Button)source).Attributes["old_qty"].ToString();
        string controlID = ((Button)source).Attributes["Control_id"].ToString();
        string detail = ((Button)source).Attributes["detail"].ToString();

        string itemQtyEdit = Request.Form["ctl00$ContentPlaceHolder1$Daily" + detail + "1$rpt_Ticket$ctl" + controlID + "$rpt_TicketDetail$ctl0" + idx + "$txt_qty"].ToString();
    //ctl00$ContentPlaceHolder1$DailyReceipts1$rpt_Ticket$ctl01$rpt_TicketDetail$ctl01$txt_qty
            
}