检测U盘插入并自动复制U盘里文件到D盘 C#源码,该如何处理

using System; 
 using System.Collections.Generic; 
 using System.ComponentModel; 
 using System.Data; 
 using System.Drawing; 
 using System.Linq; 
 using System.Text; 
 using System.Windows.Forms; 
 using System.IO; 
 using System.Configuration; 
 using MTClient.Utility; 
 using System.Threading; 

 namespace UDiskMonitor 
 { 
   public partial class MainForm : Form 
   { 
     bool isCopy = false; 
     bool isCopyEnd = false; 
     string targetdir = null; 

     public const int WM_DEVICECHANGE = 0x219; 
     public const int DBT_DEVICEARRIVAL = 0x8000; 
     public const int DBT_CONFIGCHANGECANCELED = 0x0019; 
     public const int DBT_CONFIGCHANGED = 0x0018; 
     public const int DBT_CUSTOMEVENT = 0x8006; 
     public const int DBT_DEVICEQUERYREMOVE = 0x8001; 
     public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002; 
     public const int DBT_DEVICEREMOVECOMPLETE = 0x8004; 
     public const int DBT_DEVICEREMOVEPENDING = 0x8003; 
     public const int DBT_DEVICETYPESPECIFIC = 0x8005; 
     public const int DBT_DEVNODES_CHANGED = 0x0007; 
     public const int DBT_QUERYCHANGECONFIG = 0x0017; 
     public const int DBT_USERDEFINED = 0xFFFF; 

     public MainForm() 
     { 
       InitializeComponent(); 
     } 

     private void MainForm_Load(object sender, EventArgs e) 
     { 

     } 

     private void CopyFile(string path) 
     { 
       isCopyEnd = true; 
       if (isCopy) 
       { 
         DirectoryHelper dir = new DirectoryHelper(); 
         targetdir = DateTime.Now.ToString(); 
         targetdir = targetdir.Replace(':', '-'); 
         targetdir = ConfigReader.GetValue("targetdir") + targetdir; 
         //ConfigurationManager.AppSettings["targetdir"].ToString() + targetdir; 
         if (!Directory.Exists(targetdir)) 
         { 
           Directory.CreateDirectory(targetdir); 
         } 
         else 
         { 
           listBox1.Items.Add(DateTime.Now.ToString() + "--> 文件夹已经存在，请确认！"); 
           return; 
         } 

         dir.CopyDirectoryAndFiles(targetdir, new DirectoryInfo(path)); 
         listBox1.Items.Add(DateTime.Now.ToString() + "--> 已完成数据拷贝！"); 
         listBox1.Items.Add(DateTime.Now.ToString() + "--> 正在检查文件合法性！"); 
         listBox1.Items.Add(DateTime.Now.ToString() + "--> 文件合法！"); 
         listBox1.Items.Add(DateTime.Now.ToString() + "--> 数据正在入库！"); 
       } 
     } 

     protected override void WndProc(ref Message m) 
     { 
       try 
       { 
         if (m.Msg == WM_DEVICECHANGE) 
         { 
           switch (m.WParam.ToInt32())