aspx文件
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DropDownList.aspx.cs" Inherits="WebControls_DropDownList" %> <!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>DropDownList（下拉框）</h3>
<table style="width: 100%;">
<tr>
<td>
属性</td>
<td>
值</td>
<td>
作用</td>
</tr>
</table>
<hr />
省份：<asp:DropDownList ID="dropProv" runat="server">
<asp:ListItem> 山东</asp:ListItem>
<asp:ListItem Selected="True">河北</asp:ListItem>
<asp:ListItem>山西</asp:ListItem>
</asp:DropDownList>
<br />
<asp:Button ID="btnSubmit" runat="server" Text="提交" onclick="btnSubmit_Click" />
<hr />
你选的省份为：<asp:Label ID="lblState" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
aspx.cs文件
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls; public partial class WebControls_DropDownList : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ }
protected void btnSubmit_Click(object sender, EventArgs e)
{
lblState.Text = dropProv.SelectedValue;
}
}