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=" 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; } }