ImageFile imageFile = null;

            CommonDialogClass cdc = new WIA.CommonDialogClass();

            

            try

            {

                imageFile = cdc.ShowAcquireImage(WIA.WiaDeviceType.ScannerDeviceType,

                                                 WIA.WiaImageIntent.TextIntent,

                                                 WIA.WiaImageBias.MaximizeQuality,

                                                 "{00000000-0000-0000-0000-000000000000}",

                                                 true,

                                                 true,

                                                 false);

            }

            catch (System.Runtime.InteropServices.COMException)

            {

                imageFile = null;

            }