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<asp:UpdatePanelID="UpdatePanel1"
        UpdateMode="Conditional"
        runat="server">
    <ContentTemplate>
        <asp:Button ID="Button1"
            Text="RefreshPanel"
            runat="server"/>
    </ContentTemplate>
</asp:UpdatePanel>
2
<%@ Register Assembly="Microsoft.Web.Atlas" Namespace="Microsoft.Web.UI" TagPrefix="cc1" %>
    <cc1:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="True">
    </cc1:ScriptManager>
<asp:DropDownList ID="aaa" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlthumbnail_SelectedIndexChanged">
                        </asp:DropDownList>
                        <cc1:UpdatePanel ID="UpdatePanel1" runat="server">
                            <ContentTemplate>
                                <asp:Label ID="lblatnail" runat="server" Text="" Visible=false></asp:Label>
                                <asp:LinkButton ID="lbtnatnail" runat="server" Visible=false>View</asp:LinkButton>&


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