read file directory

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 BusinessMonthPlan
{
	/// <summary>
	/// WebForm4 の概要の説明です。
	/// </summary>
	public class WebForm4 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.ListBox FileList;
		protected System.Web.UI.WebControls.Button Button1;
		protected System.Web.UI.WebControls.Button Button2;
		protected System.Web.UI.WebControls.Button Button3;
		protected string CurrentPath;
		private void Page_Load(object sender, System.EventArgs e)
		{
			if(Page.IsPostBack==false)
　			{
　　			CurrentPath= @"c:\UserDir"; //?置当前目?
				int aa=CurrentPath.IndexOf(".");
　　			if(Directory.Exists(@"c:\UserDir")==false) //若?目?不存在，?建?目?
　　　			Directory.CreateDirectory(@"c:\UserDir");
　　　			LoadDir(CurrentPath); //初始化装入目?

　			}

		}
		private void LoadDir(string FullPath)
		{
　			CurrentPath=FullPath;
　			ArrayList values = new ArrayList();
　			string [] MyFiles,MyDirs;
　			MyFiles = Directory.GetFiles(FullPath); //得到?目?下所有文件
　			if(CurrentPath!=@"c:\UserDir") //若不是??目?，增加“返回上?目?”?? 

　			values.AddRange(MyFiles); //加入文件
　			MyDirs= Directory.GetDirectories(FullPath); //得到?目?下所有目?
　			values.AddRange(MyDirs); //加入目?
　			FileList.DataSource=values; //?置数据源
　			FileList.DataBind(); //?定数据
		}



		private void Button1_Click(object sender, System.EventArgs e)
		{
			//if(FileList.SelectedItem.Text=="返回上?目?") //返回上?目?
　			//{
　　			//string ParentPath1=Directory.GetParent(CurrentPath).ToString();
				string ParentPath=this.FileList.SelectedItem.Text.ToString();
				Session["aa"]=ParentPath;
　　			LoadDir(ParentPath);
　　			return;
　			//}
　			//else //打?目?

		}

		private void Button2_Click(object sender, System.EventArgs e)
		{
			//string aa=1;
			//string ParentPath=this.FileList.SelectedItem.Text.ToString();
			string aa;
			aa=Directory.GetCurrentDirectory().ToString();

			string ParentPath1=Directory.GetParent(aa).ToString();
			
			
				
　　			LoadDir(ParentPath1);
　　			return;
		}

		private void Button3_Click(object sender, System.EventArgs e)
		{
		
			//string ParentPath=this.FileList.SelectedItem.Text.ToString();
			string aa;
			aa=@"C:\UserDir\aa\新しいフォルダ";

			string ParentPath1=Directory.GetParent(Session["aa"].ToString()).ToString();
			
			Session["aa"]=ParentPath1;

　　			LoadDir(ParentPath1);
　　			return;
		}

		private void FileList_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			string ParentPath=this.FileList.SelectedItem.Text.ToString();
			Session["aa"]=ParentPath;
　　			LoadDir(ParentPath);
　　			return;
		}
	}
}