aspx：
<%@ Page language="c#" Codebehind="FileManage.aspx.cs" AutoEventWireup="false" Inherits="HMG.WebControls.TestProject.FileManage" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>简单的web文件管理器</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <META http-equiv=Content-Type content="text/html; charset=gb2312">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <div>
                <table>
                    <thead>
                        <tr>
                            <th colspan="5">
                                当前目录为：<asp:Label Runat="server" ID="lbDir"></asp:Label></th>
                        </tr>
                        <tr>
                            <TH width="30">
                                &nbsp;</TH>
                            <TH align="left" width="450">
                                名字&gt;</TH>
                            <TH width="80">
                                大小
                            </TH>
                            <TH width="200">
                                最后修改时间
                            </TH>
                            <TH width="50">
                                删除
                            </TH>
                        </tr>
                    </thead>
                    <tbody>
                    
                    <asp:PlaceHolder Runat="server" ID="phContent"></asp:PlaceHolder>
                    </tbody>
                </table>
            </div>
        </form>
    </body>
</HTML>

cs：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;

namespace HMG.WebControls.TestProject
{
    /// <summary>
    /// FileManage 的摘要说明。
    /// </summary>
    public class FileManage : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.PlaceHolder phContent;
        protected System.Web.UI.WebControls.Label lbDir;
        protected const string Seperator="</td><td>";
        protected const string UpLevel="../";
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            if(!IsPostBack)
            {
                
            }
            if(Session["Path"]==null)
            {
                this.SetDefault();
            }
            
            this.ShowPath(Session["Path"].ToString());
        }
        public string GetDefault()
        {
            return "/";
        }

        private void SetDefault()
        {
            Session["Path"]="/";
        }
        private void ShowPath(string path)
        {
            System.IO.DirectoryInfo  root=new DirectoryInfo(Server.MapPath(path));
            if(!root.Exists)
            {
                Literal nocontent=new System.Web.UI.WebControls.Literal();
                nocontent.Text="<tr><td colspan='5'>没有找到该目录！</td></tr>";
                this.phContent.Controls.Add(nocontent);
            }
            else
            {
                this.lbDir.Text=Session["Path"].ToString();
                if(path!=this.GetDefault())
                {
                    Literal seperator = new Literal();
                    seperator.Text=FileManage.Seperator;
                    Literal seperator1 = new Literal();
                    seperator1.Text=FileManage.Seperator;
                    Literal seperator2 = new Literal();
                    seperator2.Text=FileManage.Seperator;
                    Literal endRow = new Literal();
                    endRow.Text = "</td></tr>";
                    

                    //显示图标
                    Literal picColumn = new Literal();                    
                    picColumn.Text = "<TR><td><img src=pics/folder.gif></td><td>";
                
                    // 点击按钮事件
                    LinkButton lbtnDir = new LinkButton();
                    lbtnDir.Text =UpLevel.ToString();
                    lbtnDir.CommandArgument = UpLevel.ToString();
                    lbtnDir.Command +=new CommandEventHandler(lbtnDir_Command);
                    
                
                
                    

                    // 添加到容器中
                    this.phContent.Controls.Add(picColumn);
                    this.phContent.Controls.Add(lbtnDir);
                    this.phContent.Controls.Add(seperator);
                    this.phContent.Controls.Add(seperator1);
                    this.phContent.Controls.Add(seperator2);
                
                    this.phContent.Controls.Add(endRow);

                }
                foreach(DirectoryInfo d in root.GetDirectories())
                {                
                    //间隔的文本
                    Literal seperator = new Literal();
                    seperator.Text=FileManage.Seperator;
                    Literal seperator1 = new Literal();
                    seperator1.Text=FileManage.Seperator;
                    Literal seperator2 = new Literal();
                    seperator2.Text=FileManage.Seperator;
                    Literal endRow = new Literal();
                    endRow.Text = "</td></tr>";
                    

                    //显示图标
                    Literal picColumn = new Literal();                    
                    picColumn.Text = "<TR><td><img src=pics/folder.gif></td><td>";
                
                    // 点击按钮事件
                    LinkButton lbtnDir = new LinkButton();
                    lbtnDir.Text = d.Name.ToString();
                    lbtnDir.CommandArgument = d.Name.ToString();
                    lbtnDir.Command +=new CommandEventHandler(lbtnDir_Command);

                    //删除按钮
                    System.Web.UI.WebControls.ImageButton deleteBtn=new ImageButton();
                    deleteBtn.ImageUrl= "pics/delete_icon.gif";
                    deleteBtn.Attributes.Add("onclick","javascript:return confirm('确定删除目录："+d.Name+"吗？');");
                    deleteBtn.CommandName="DeleteDir";
                    deleteBtn.CommandArgument=d.Name;
                    deleteBtn.Command+=new CommandEventHandler(deleteBtn_Command);
                    //HyperLink deleteBtn = new HyperLink();
                    //deleteBtn.ImageUrl = "pics/delete_icon.gif";
                    //deleteBtn.NavigateUrl = "javascript:confirmDelete('FileDelete.aspx?Type=Folder&Name=" + Server.UrlEncode(Session["Path"].ToString() + d.Name.ToString()) + "','" + d.Name.ToString()+ "');";
                
                    

                    // 添加到容器中
                    this.phContent.Controls.Add(picColumn);
                    this.phContent.Controls.Add(lbtnDir);
                    this.phContent.Controls.Add(seperator);
                    this.phContent.Controls.Add(seperator1);
                    this.phContent.Controls.Add(seperator2);
                    this.phContent.Controls.Add(deleteBtn);
                    this.phContent.Controls.Add(endRow);

                    
                }

                foreach(FileInfo f in root.GetFiles())
                {    
                    //间隔的文本
                    Literal seperator = new Literal();
                    seperator.Text=FileManage.Seperator;
                    Literal seperator1 = new Literal();
                    seperator1.Text=FileManage.Seperator;
                    Literal seperator2 = new Literal();
                    seperator2.Text=FileManage.Seperator;
                    Literal endRow = new Literal();
                    endRow.Text = "</td></tr>";
                    

                    Literal newColumn = new Literal();
                    newColumn.Text = "</td> <td>";

                    //显示图标
                    Literal picColumn = new Literal();
            
                    picColumn.Text = "<TR><td><img src=pics/file.gif></td><td>";
                    
                
                    // 删除按钮
                    HyperLink goToBtn = new HyperLink();
                    goToBtn.Text = f.Name.ToString();
                    goToBtn.NavigateUrl = "http://" + Request.ServerVariables["SERVER_NAME"].ToString() + Session["Path"].ToString() + f.Name.ToString();
                    goToBtn.Target="_blank";

                    long fileSize = f.Length;
                    string fileSizeStr;
                    if(fileSize > 1000000) fileSizeStr = fileSize/1000000 + " Mb";
                    else if(fileSize > 1000) fileSizeStr = fileSize/1000 + " Kb";
                    else fileSizeStr = fileSize + " b";


                    Label sizeLbl = new Label();
                    sizeLbl.Text = fileSizeStr;


                    Label modLbl = new Label();
                    modLbl.Text = f.LastWriteTime.ToString();
                

                    System.Web.UI.WebControls.ImageButton deleteBtn=new ImageButton();
                    deleteBtn.ImageUrl= "pics/delete_icon.gif";
                    deleteBtn.Attributes.Add("onclick","javascript:return confirm('确定删除文件："+f.Name+"吗？');");
                    deleteBtn.CommandName="DeleteFile";
                    deleteBtn.CommandArgument=f.Name;
                    deleteBtn.Command+=new CommandEventHandler(deleteBtn_Command);

                    //HyperLink deleteBtn = new HyperLink();
                    //deleteBtn.ImageUrl = "pics/delete_icon.gif";
                    //deleteBtn.NavigateUrl = "javascript:confirmDelete('FileDelete.aspx?Type=File&Name=" + Server.UrlEncode(Session["Path"].ToString() + f.Name.ToString()) + "','" + f.Name.ToString()+ "');";

                    this.phContent.Controls.Add(picColumn);
                    this.phContent.Controls.Add(goToBtn);
                    this.phContent.Controls.Add(seperator);
                    this.phContent.Controls.Add(sizeLbl);
                    this.phContent.Controls.Add(seperator1);
                    this.phContent.Controls.Add(modLbl);
                    this.phContent.Controls.Add(seperator2);
                    this.phContent.Controls.Add(deleteBtn);
                    this.phContent.Controls.Add(endRow);    

                }
            }

        }

        Web 窗体设计器生成的代码

        private void lbtnDir_Command(object sender, CommandEventArgs e)
        {
            if(e.CommandArgument.ToString() == "/")    
                Session["Path"] = "/";
            else if(e.CommandArgument.ToString() == "../") 
                Session["Path"] = this.GetParentDirectory();
            else    
                Session["Path"] = Session["Path"].ToString()+ e.CommandArgument.ToString() + "/";            
            Response.Redirect("FileManage.aspx");

        }

        private string GetParentDirectory()
        {
            string path = Session["Path"].ToString();
            if(path == "./")
                return  this.GetDefault();
            else if(path == this.GetDefault())
                return this.GetDefault();    
            else
            {

                if(path.LastIndexOf("/") == path.Length-1)
                {    
                    path = path.Remove(path.LastIndexOf("/"), (path.Length - path.LastIndexOf("/")));
                }
                try
                {
                    path = path.Remove(path.LastIndexOf("/"), (path.Length - path.LastIndexOf("/")));
                    return(path + "/");
                }
                catch(ArgumentOutOfRangeException ex)
                {
                    return  this.GetDefault();    
                }
            }
        }

        private void deleteBtn_Command(object sender, CommandEventArgs e)
        {
            if(e.CommandName=="DeleteFile")
            {
                System.Diagnostics.Debug.WriteLine(Server.MapPath(this.lbDir.Text+e.CommandArgument.ToString()));
                FileInfo file = new FileInfo(Server.MapPath(this.lbDir.Text+e.CommandArgument.ToString()));
                try
                {
                    file.Delete();
                    //File.Delete(Server.MapPath(Server.UrlDecode(Request.QueryString["Name"].ToString())));
                    
                    Response.Redirect("FileManage.aspx");
                }
                catch(Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine(ex.ToString());
                }    

            }
            else
            {
                try
                {
                    DirectoryInfo dir = new DirectoryInfo(Server.MapPath(this.lbDir.Text+e.CommandArgument.ToString()));
                    dir.Delete();                            
                    Response.Redirect("FileManage.aspx");
                }
                
                    
                catch(Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine(ex.ToString());
                        
                }
            }
        }
    }
}