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📄 default.aspx

📁 ajax学习环境的配置文件
💻 ASPX
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" EnableEventValidation="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />

        <table>
            <tr>
                <td>Make</td>
                <td><asp:DropDownList ID="DropDownList1" runat="server" Width="170" /></td>
            </tr>
            <tr>
                <td>Model</td>
                <td><asp:DropDownList ID="DropDownList2" runat="server" Width="170" /></td>
            </tr>
            <tr>
                <td>Color</td>
                <td><asp:DropDownList ID="DropDownList3" runat="server" Width="170" AutoPostBack="true"
                    OnSelectedIndexChanged="DropDownList3_SelectedIndexChanged" /></td>
            </tr>
        </table>
        <br />
        
        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="DropDownList1"
            Category="Make"  PromptText="Please select a make"  LoadingText="[Loading makes...]"
            ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents" />
        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown2" runat="server" TargetControlID="DropDownList2"
            Category="Model" PromptText="Please select a model" LoadingText="[Loading models...]"
            ServiceMethod="GetDropDownContentsPageMethod" ParentControlID="DropDownList1" />
        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown3" runat="server" TargetControlID="DropDownList3"
            Category="Color" PromptText="Please select a color" LoadingText="[Loading colors...]"
            ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents"
            ParentControlID="DropDownList2" />
      
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" RenderMode="inline">
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="[No response provided yet]" />
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="DropDownList3" EventName="SelectedIndexChanged" />
            </Triggers>
        </asp:UpdatePanel>

    </form>
</body>
</html>

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