📄 default.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" EnableEventValidation="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>51aspx省市区县（含完整数据库）无刷新联动</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddlProvince" runat="server">
</asp:DropDownList><asp:DropDownList ID="ddlCity" runat="server">
</asp:DropDownList><asp:DropDownList ID="ddlVilliage" runat="server">
</asp:DropDownList><ajax:CascadingDropDown ID="CascadingDropDown2" runat="server" TargetControlID="ddlProvince" ServicePath="SNWebService.asmx" ServiceMethod="GetProvinceContents" Category="Province" PromptText="请选择省份" LoadingText="省份加载中...">
</ajax:CascadingDropDown>
<ajax:CascadingDropDown ID="CascadingDropDown1" runat="server" ParentControlID="ddlProvince" ServicePath="SNWebService.asmx" ServiceMethod="GetCityContents" Category="City" TargetControlID="ddlCity" PromptText="请选择城市" LoadingText="城市加载中...">
</ajax:CascadingDropDown>
<ajax:CascadingDropDown ID="CascadingDropDown3" runat="server" Category="Villiage" LoadingText="区县加载中..."
ParentControlID="ddlCity" PromptText="请选择区县" ServiceMethod="GetViliageContents"
ServicePath="SNWebService.asmx" TargetControlID="ddlVilliage">
</ajax:CascadingDropDown>
</ContentTemplate>
</asp:UpdatePanel>
<br />
</div>
</form>
</body>
</html>
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