asp.net中怎样实现点击左侧菜单，右侧显示相应内容？

Question

asp.net的一个主页面，左侧是一个树形菜单，节点数据从数据库中获取，
子节点数量超过五百个，点击不同的子节点，右侧显示相对应的内容（该节点
信息：图片，名称等），我查百度有人说右侧放div，个数与左侧菜单数量一
样多，这个明显不符合我这个页面需求，请问大神们这个怎么布局，怎么实现？

Answer 1

完整代码：https://download.csdn.net/download/caozhy/11064697

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<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="Q753697._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

<style>
    #content:after{
      content: '';
      display: block;
      clear: both;
    }
    .aside{
      width: 200px;
      height: 500px;
      float: left;
    }
    .main{
      margin-left: 210px;
      height: 400px;
    }

  </style>
  <div id="content">
    <div class="aside">
        <asp:TreeView ID="TreeView1" runat="server" 
        onselectednodechanged="TreeView1_SelectedNodeChanged1" ShowLines="True">
        </asp:TreeView>
    </div>
    <div class="main">
        <asp:Panel ID="Panel1" runat="server" Height="245px">
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    </asp:Panel>
    </div>
  </div>
</asp:Content>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Q753697
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                var tn = new TreeNode() { Text = "Parent" };
                TreeNode tn1;
                TreeView1.Nodes.Add(tn);
                for (int i = 0; i < 10; i++)
                {
                    tn1 = new TreeNode() { Text = "Middle" + i.ToString() };
                    tn.ChildNodes.Add(tn1);
                    for (int j = 0; j < 10; j++)
                    {
                        tn1.ChildNodes.Add(new TreeNode() { Text = "child" + j.ToString() });
                    }
                }
                TreeView1.CollapseAll();
            }
        }

        protected void TreeView1_SelectedNodeChanged1(object sender, EventArgs e)
        {
            Label1.Text = TreeView1.SelectedNode.Text + "一些文字一些文字";
            for (int i = 1; i <= 5; i++)
                Label1.Text = Label1.Text + Label1.Text;
        }
    }
}