diff --git "a/15\347\216\213\351\233\252\347\202\234/\347\273\203\344\271\240/\346\225\260\346\215\256\347\273\221\345\256\232/WebForm1.aspx" "b/15\347\216\213\351\233\252\347\202\234/\347\273\203\344\271\240/\346\225\260\346\215\256\347\273\221\345\256\232/WebForm1.aspx"
new file mode 100644
index 0000000000000000000000000000000000000000..5575b1746647452832401ebe36d0ca67f87c46cd
--- /dev/null
+++ "b/15\347\216\213\351\233\252\347\202\234/\347\273\203\344\271\240/\346\225\260\346\215\256\347\273\221\345\256\232/WebForm1.aspx"
@@ -0,0 +1,21 @@
+﻿<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="web_003.WebForm1" %>
+
+<!DOCTYPE html>
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head runat="server">
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+    <title></title>
+</head>
+<body>
+    <form id="form1" runat="server">
+        <div>
+            省份：<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="cityName" DataValueField="id" OnTextChanged="DropDownList1_TextChanged"></asp:DropDownList>
+            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:CityDBConnectionString %>" SelectCommand="SELECT * FROM [city]"></asp:SqlDataSource>
+            城市：<asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="SqlDataSource2" DataTextField="cityName" DataValueField="id"></asp:DropDownList>
+            <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:CityDBConnectionString %>" SelectCommand="SELECT * FROM [city]"></asp:SqlDataSource>
+            区县：<asp:DropDownList ID="DropDownList3" runat="server"></asp:DropDownList>
+        </div>
+    </form>
+</body>
+</html>
diff --git "a/15\347\216\213\351\233\252\347\202\234/\347\273\203\344\271\240/\346\225\260\346\215\256\347\273\221\345\256\232/WebForm1.aspx.cs" "b/15\347\216\213\351\233\252\347\202\234/\347\273\203\344\271\240/\346\225\260\346\215\256\347\273\221\345\256\232/WebForm1.aspx.cs"
new file mode 100644
index 0000000000000000000000000000000000000000..8e083a507e4d78d61bf373ff1879a36e2880f34a
--- /dev/null
+++ "b/15\347\216\213\351\233\252\347\202\234/\347\273\203\344\271\240/\346\225\260\346\215\256\347\273\221\345\256\232/WebForm1.aspx.cs"
@@ -0,0 +1,22 @@
+﻿using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+
+namespace web_003
+{
+    public partial class WebForm1 : System.Web.UI.Page
+    {
+        protected void Page_Load(object sender, EventArgs e)
+        {
+            SqlDataSource1.SelectCommand = "select id,cityName from city where type = 1";
+        }
+
+        protected void DropDownList1_TextChanged(object sender, EventArgs e)
+        {
+            SqlDataSource2.SelectCommand = "select * from city where type = 2 and pid="+DropDownList1.SelectedValue;
+        }
+    }
+}
\ No newline at end of file
