📄 cascdropdownlist.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="cascdropdownlist.aspx.cs" Inherits="cascdropdownlist" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:DropDownList ID="DropDownList1" runat="server" Width="147px">
</asp:DropDownList><br />
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
<asp:DropDownList ID="DropDownList2" runat="server" Width="146px">
</asp:DropDownList><br />
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
<asp:DropDownList ID="DropDownList3" runat="server" Width="146px">
</asp:DropDownList><br />
<ajaxToolkit:CascadingDropDown ID="CascadingDropDown1" runat="server" ServiceMethod="GetDropDownContents"
UseContextKey="True">
</ajaxToolkit:CascadingDropDown>
</div>
<ajaxToolkit:CascadingDropDown ID="CascadingDropDown2" runat="server">
</ajaxToolkit:CascadingDropDown>
<ajaxToolkit:CascadingDropDown ID="CascadingDropDown3" runat="server">
</ajaxToolkit:CascadingDropDown>
</form>
</body>
</html>
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