dropdown - 想要在页面加载时将下拉值放入文本框中，下拉值从 asp.net C# 中的数据库中获取

Question

.aspx File
<%@ Page Title="" Language="C#" MasterPageFile="~/MenuMaster.Master" ` 

AutoEventWireup="true"CodeBehind="SubjectList.aspx.cs" Inherits="final2.SubjectList" %> <asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server"> `` .auto-style2 { width: 1155px; } </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server"> <asp:Panel ID="Panel1" runat="server" Width="1159px"> <asp:标签 ID="Label3" runat="server" Text="Semester"></asp:Label> <asp:DropDownList ID="DropDownList3" runat="server" DataSourceID="Semester" DataTextField="Semester" DataValueField="学期" OnTextChanged="DropDownList3_TextChanged" AutoPostBack="true"><

.aspx.cs File

protected void Page_Load(object sender, EventArgs e)

{ TextBox1.Text = DropDownList3.SelectedValue;// 不给出文本框中下拉列表的值 }

标签： dropdownpageload