C#

catch (COMException ex)
{
uint errorCode = (uint)ex.ErrorCode;
if (errorCode == 0x80210003)
{
    MessageBox.Show("Load the scaner device!");
}
else
{
    MessageBox.Show(ex.Message);
}

for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
{
  if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
  {
    continue;
  }
  AvailableScanner = deviceManager.DeviceInfos[i];
  break;
}
if (AvailableScanner == null)
{
  return;
}
var device = AvailableScanner.Connect();
while (continueRunning2)
{
  // Are you absolutely certain you want array index 1 here?
  // Remember that arrays start at 0, so this might be a cause of
  // issues
  var ScanerItem = device.Items[1];
  ...
}

Thanks but it didn't work. now the problem is with if statement which you added.
according to your suggetion, i changed it like below:
could you please say where is the problem?

int n = 1;
bool continueRunning2 = true;
try
    {
        await Task.Run(() =>
        {
            var deviceManager = new DeviceManager();

            DeviceInfo AvailableScanner = null;

                for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
                {
                    if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                    {
                        continue;
                    }

                    AvailableScanner = deviceManager.DeviceInfos[i];
                    break;
                }

                if (AvailableScanner != null)
                {
                    return;
                }

            var device = AvailableScanner.Connect();
            while (continueRunning2)
            {
                var ScanerItem = device.Items[1];
                var imgFile = (ImageFile)ScanerItem.Transfer();

                var data = (byte[])imgFile.FileData.get_BinaryData();
                var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);

                var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
                n++;
                bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);

            }
        });

    }
    catch (COMException ex)
    {
    MessageBox.Show(ex.Message);
    }

if (AvailableScanner == null)

i changed it but it still has the same problem as before (it shows the error of loading paper).

Below is my complete code, could you please check/correct it?

try
{

    object[] items = await Task.Run<object[]>(() =>
    {

        var deviceManager = new DeviceManager();
        List<object> result = new List<object>();


        for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++) // Loop Through the get List Of Devices.
            {
            if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                {
                continue;
            }
                //new
                result.Add(deviceManager.DeviceInfos[i].Properties["Name"].get_Value());
        }
        return result.ToArray();


    });

    foreach (var item in items)
    {
        lstListOfScanner.Items.Add(item);
    }

}
catch (COMException ex)
{
    MessageBox.Show(ex.Message);
}

int n = 1;
bool continueRunning2 = true;
try
{
    await Task.Run(() =>
        {
            var deviceManager = new DeviceManager();

            DeviceInfo AvailableScanner = null;

            for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
            {
                if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
                {
                    continue;
                }

                AvailableScanner = deviceManager.DeviceInfos[i];
                break;
            }

            if (AvailableScanner == null)
            {
                return;
            }

            var device = AvailableScanner.Connect();
            while (continueRunning2)
            {
                var ScanerItem = device.Items[1];
                var imgFile = (ImageFile)ScanerItem.Transfer();
                var data = (byte[])imgFile.FileData.get_BinaryData();
                var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
                var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
                n++;
                bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
        });

}
catch (COMException ex)
{
    MessageBox.Show(ex.Message);
}

await Task.Run(() =>
 {
   var deviceManager = new DeviceManager();

   DeviceInfo AvailableScanner = null;

   for (int i = 1; i <= deviceManager.DeviceInfos.Count; i++)
   {
     if (deviceManager.DeviceInfos[i].Type != WiaDeviceType.ScannerDeviceType) // Skip device If it is not a scanner
     {
         continue;
     }

     AvailableScanner = deviceManager.DeviceInfos[i];
     break;
   }

   if (AvailableScanner == null)
   {
       return;
   }

   var device = AvailableScanner.Connect();
   bool hasScannedPage = false;
   while (continueRunning2)
   {
	  var ScanerItem = device.Items[1];
	  ImageFile imgFile = null;
	  try
	  {
	    imgFile = (ImageFile)ScanerItem.Transfer();
	  }
	  catch (COMException ex)
	  {
		 uint errorCode = (uint)ex.ErrorCode;
		 if (errorCode == 0x80210003 && !hasScannedPage)
		 {
		   // At this point, you know that you have not managed to scan
		   // any pages and you are receiving a paper out message, so
		   // you can inform the user that they need to load the device
		   MessageBox.Show("You cannot scan anything without loading the device");
		 }
		 // You cannot go any further so break out of the loop
		 break;
	  }
	  // By setting hasScannedPage to true, you won't show the message to the user
	  hasScannedPage = true;
	  var data = (byte[])imgFile.FileData.get_BinaryData();
	  var bitmap = GetBitmapFromRawData(imgFile.Width, imgFile.Height, data);
	  var Path = @"C:\Users\...\Desktop\test\" + n + ".jpg"; // save the image in some path with filename.
	  n++;
	  bitmap.Save(Path, System.Drawing.Imaging.ImageFormat.Jpeg);
   }
 });

//loading the image from D drive to the picturebox and then extract the QRcode number into textbox2
private void button2_Click(object sender, EventArgs e)
{

    var Path = @"D:\1.jpg";
    pictureBox1.Image = Image.FromFile(Path);
    MessagingToolkit.QRCode.Codec.QRCodeDecoder decoder = new MessagingToolkit.QRCode.Codec.QRCodeDecoder();
    textBox2.Text = decoder.Decode(new QRCodeBitmapImage(pictureBox1.Image as Bitmap));

}

//Deleting 1.jpg
private void button3_Click(object sender, EventArgs e)
{
     if (File.Exists(@"D:\1.jpg"))
    {
        System.IO.File.Delete(@"D:\1.jpg");

    }
}

// Create an in-process speech recognizer for the en-US locale. 
using ( SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine( new System.Globalization.CultureInfo("vi-VN")))//You must set up Vietnamese pronunciation codes or pronunciation codes for other languages you need
  {
        ... 
  }