FTD2XX_NET.FTDI.GetDescription C# (CSharp) Method

        public FT_STATUS GetDescription(out string Description)
        {
            // Initialise ftStatus to something other than FT_OK
            FT_STATUS ftStatus = FT_STATUS.FT_OTHER_ERROR;

            Description = String.Empty;

            // If the DLL hasn't been loaded, just return here
            if (hFTD2XXDLL == IntPtr.Zero)
                return ftStatus;

            // Check for our required function pointers being set up
            if (pFT_GetDeviceInfo != IntPtr.Zero)
            {
                tFT_GetDeviceInfo FT_GetDeviceInfo = (tFT_GetDeviceInfo)Marshal.GetDelegateForFunctionPointer(pFT_GetDeviceInfo, typeof(tFT_GetDeviceInfo));

                UInt32 DeviceID = 0;
                FT_DEVICE DeviceType = FT_DEVICE.FT_DEVICE_UNKNOWN;
                byte[] sernum = new byte[16];
                byte[] desc = new byte[64];

                if (ftHandle != IntPtr.Zero)
                {
                    // Call FT_GetDeviceInfo
                    ftStatus = FT_GetDeviceInfo(ftHandle, ref DeviceType, ref DeviceID, sernum, desc, IntPtr.Zero);
                    Description = Encoding.ASCII.GetString(desc);
                    Description = Description.Substring(0, Description.IndexOf("\0"));
                }
            }
            else
            {
                if (pFT_GetDeviceInfo == IntPtr.Zero)
                {
                    LogB.Debug("FTD2XX: Failed to load function FT_GetDeviceInfo.");
                }
            }
            return ftStatus;
        }

        /// <summary>
        /// Called when the window is loaded
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void WindowLoaded(object sender, RoutedEventArgs e)
        {
            int i;
            
            // Configure datagrid
            dataGrid1.Items.Clear();
            dataGrid1.Columns.Clear();
            dataGrid1.Columns.Add(new DataGridTextColumn { Header = "Device Number", Binding = new Binding("Dn") });
            dataGrid1.Columns.Add(new DataGridTextColumn { Header = "Serial Number", Binding = new Binding("Sn") });
            dataGrid1.Columns.Add(new DataGridTextColumn { Header = "Device Description", Binding = new Binding("Dd") });

            // Get FTDI basic data
            FTDI f = new FTDI();
            uint devicecount = 0;
            f.GetNumberOfDevices(ref devicecount);

            // Fill datagrid with device data
            string dd, sn, dn;
            if (devicecount == 0)
            {
                FtErrorReport("GetFTDeviceCount", FTDI.FT_STATUS.FT_DEVICE_NOT_FOUND);
            }
            for (i = 0; i < devicecount; i++)
            {
                f.OpenByIndex((uint)i);
                dn = String.Format("Device {0}", i);
                f.GetSerialNumber(out sn);
                f.GetDescription(out dd);
                f.Close();
                dataGrid1.Items.Add( new SDevice{ Dd = dd, Dn = dn, Sn = sn } );
            }
        }