FormView控制項中實現DropDownList+Ajax級聯時，整個頁面只能有一個ScriptManager控制項，且ScripManager控制項不能放在FormView裡，而應放在Form下，FormView控制項之前，否則會出現“只能向頁面中添加 ScriptManager 的一個執行個體”的錯誤。
<body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager><!--asp:ScriptManager在這裡,一個就足夠了--> <div> <asp:UpdatePanel ID="UpdatePanel1" runat="server">> <!--asp:UpdatePanel 1在這裡--> <div> <ContentTemplate> <!--ContentTemplate容器--> <div> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> <asp:Button ID="Button1" runat="server" Text="Button"></asp:Button>
</ContentTemplate> </asp:UpdatePanel> <!--asp:UpdatePanel 1在這裡--> <div> </div> <div> <asp:UpdatePanel ID="UpdatePanel2" runat="server" RenderMode="Inline"> <!--asp:UpdatePanel 2在這裡--> <div>
<ContentTemplate> <asp:DropDownList ID="ddlBrand" runat="server" AutoPostBack="true"> <asp:ListItem Text="請選擇所屬品牌" Value="0" /> </asp:DropDownList> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="ddlCarxID" EventName="SelectedIndexChanged" /> </Triggers> </asp:UpdatePanel> <!--asp:UpdatePanel 2在這裡--> <div>
<asp:DropDownList ID="ddlCarxID" runat="server"> <asp:ListItem Text="請選擇汽車車系" Value="0"></asp:ListItem> </asp:DropDownList> </div> </form></body>
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