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create a web page as 2 parts

<script type="text/javascript">

$('#buttonid').click(function() {

    $('#divid').append("<form><input />etc etc etc</form>");

});

</script>

       

<asp:ScriptManager ID="sm" runat="server"></asp:ScriptManager>

        <asp:UpdatePanel id="upnl" runat="server" ChildrenAsTriggers="true">

            <ContentTemplate>

                <asp:Panel ID="pnl1" runat="server">

                    <!--personal info-->

                    <asp:Button ID="btn1" runat="server" Text="this button could validate personal info, hide pnl1 and show pnl2" />

                </asp:Panel>

                <asp:Panel ID="pn2" runat="server" Visible="false">

                    <!--address info-->

                    <asp:Button id="btn2" runat="server" Text="this button could validate address information and finally submit the form." />

                </asp:Panel>

            </ContentTemplate>

        </asp:UpdatePanel>