const int WM_DEVICECHANGE = 0x2190;
const int DBT_DEVICEARRIVAL = 0x8000;
const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
protected override void WndProc(ref Message m)
{
 try
 {
  //if (m.Msg == WM_DEVICECHANGE)
  //{
   switch (m.WParam.ToInt32())
   {
    case DBT_DEVICEARRIVAL:  // U盤(pán)插入
     DriveInfo[] s = DriveInfo.GetDrives();
     foreach (DriveInfo drive in s)
     {
      if (drive.DriveType == DriveType.Removable)
      {
       Console.WriteLine("USB插入");
       break;
      }
     }
     break;
    case DBT_DEVICEREMOVECOMPLETE: //U盤(pán)卸載
     //
     Console.WriteLine("USB卸載");
     break;
    default:
     break;
   }
  //}
 }
 catch (Exception ex)
 {
  MessageBox.Show(ex.Message);
 }
 base.WndProc(ref m);
}