A USB HID Component for C#

protected override void WndProc(ref Message m)
        {
            usb.ParseMessages(ref m);
            base.WndProc(ref m);
        }

m_hHandle = CreateFile(strPath,
                                GENERIC_READ | GENERIC_WRITE,
                                FILE_SHARE_WRITE | FILE_SHARE_READ, // changed from 0
                                IntPtr.Zero,
                                OPEN_EXISTING,
                                FILE_FLAG_OVERLAPPED,
                                IntPtr.Zero);

protected void ReadCompleted(IAsyncResult iResult)
        {
            try
            {
                byte[] arrBuff = (byte[])iResult.AsyncState;    // retrieve the read buffer
                try
                {
                    m_oFile.EndRead(iResult);   // call end read : this throws any exceptions that happened during the read
                    try
                    {
                        InputReport oInRep = CreateInputReport();   // Create the input report for the device
                        oInRep.SetData(arrBuff);    // and set the data portion - this processes the data received into a more easily understood format depending upon the report type
                        HandleDataReceived(oInRep); // pass the new input report on to the higher level handler
                    }
                    finally
                    {
                        BeginAsyncRead();   // when all that is done, kick off another read for the next report
                    }
                }
                catch (IOException ex)  // if we got an IO exception, the device was removed
                {
                    HandleDeviceRemoved();
                    if (OnDeviceRemoved != null)
                    {
                        OnDeviceRemoved(this, new EventArgs());
                    }
                    Dispose();
                }
            }
            catch
            {
                Dispose();
            }
        }

if ( usb.SpecifiedDevice != null )
    usb.SpecifiedDevice.Dispose();
usb.UnregisterHandle();
usb.Dispose();