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我已經創建了asp.net一個Web應用程序中顯示爲彈出日曆控制..我寫的代碼爲PopupControlExtender但它顯示的錯誤爲無法識別的標籤前綴AJAX popupcontrolextender
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
</div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Calendar ID="Calendar1" runat="server"></asp:Calendar>
</ContentTemplate>
</asp:UpdatePanel>
<ajax:PopupControlExtender ID="PopupControlExtender1" runat="server" TargetControlID="TextBox1"
PopupControlID="Panel1"
Position="Right"
CommitProperty="value"
OffsetX="3">