Create BarCode using C#

Create-BarCode.cs

int Resolution = 300;//300 dpi high resolution of the barcode image
int leftBarcodePosition = 10;//left position of the barcode image
int topBarcodePosition = 20;//top position of the barcode image

//create a PDF document with a new page by creating an instance of Aspose.Pdf.Document() class 
Aspose.Pdf.Document pdfDoc = new Aspose.Pdf.Document();
Aspose.Pdf.Page pdfPage = pdfDoc.Pages.Add();
//convert the barcode image to a PNG stream by instantiating an instance of BarcodeGenerator class
BarcodeGenerator generator = new BarcodeGenerator(EncodeTypes.Pdf417, "Aspose.Barcode Example");
// Invoke the Resolution property to set the barcode image resolution
generator.Parameters.Resolution = Resolution;
// Generate the barcode image by calling GenerateBarCodeImage method and assign to the Bitmap object  
Bitmap image = generator.GenerateBarCodeImage();
// Initialize an object of MemoryStream class 
MemoryStream imageStream = new MemoryStream();
// Save barcode image to stream in PNG format. 
generator.Save(imageStream, BarCodeImageFormat.Png);
imageStream.Position = 0;
Rectangle imageRect = new Rectangle(leftBarcodePosition, topBarcodePosition, (image.Width * 72) / Resolution, (image.Height * 72) / Resolution);
//Create an object of Rectangle where the image will be placed in the top/left corner 
Aspose.Pdf.Rectangle pdfRect = new Aspose.Pdf.Rectangle(imageRect.Left, pdfPage.Rect.Height - imageRect.Bottom, imageRect.Right, pdfPage.Rect.Height - imageRect.Top);
//add the image to the created PDF page by calling the AddImage method 
pdfPage.AddImage(imageStream, pdfRect);
//Invoke the save method to save the PDF document 
pdfDoc.Save("AddBarcodeToPDFDocumentDirectly.pdf");

read-barcodes.cs

// Instantiate an instance of the Document class to create a PDF document 
using (Aspose.Pdf.Document pdfDoc = new Aspose.Pdf.Document("AddBarcodeToPDFDocumentDirectly.pdf"))
    {
        // Initialize the constructor of the PdfConverter class with a PDF file 
        Aspose.Pdf.Facades.PdfConverter pdfConverter = new Aspose.Pdf.Facades.PdfConverter(pdfDoc);
        // set the barcode optimization mode by setting the BarcodeOptimization property 
        pdfConverter.RenderingOptions.BarcodeOptimization = true;
        //set resolution to the page by setting the Resolution property  
        pdfConverter.Resolution = new Aspose.Pdf.Devices.Resolution(300);
        //set all pages to render into images starting from 1st page
        pdfConverter.StartPage = 1; 
        pdfConverter.EndPage = pdfConverter.Document.Pages.Count;
        // Call this DoConvert method to render selected pages to the images 
        pdfConverter.DoConvert();
        while (pdfConverter.HasNextImage())
        {
            //render current page to memory stream as png image
            MemoryStream ms = new MemoryStream();
            pdfConverter.GetNextImage(ms, Aspose.Pdf.PageSize.A0);
            ms.Position = 0;

            //Initializes a new instance of the BarCodeReader class with default values to detect barcodes.
            BarCodeReader reader = new BarCodeReader(ms, DecodeType.Pdf417, DecodeType.QR, DecodeType.DataMatrix);
            foreach (BarCodeResult result in reader.ReadBarCodes())
                Console.WriteLine($"Barcode type:{result.CodeTypeName}, Barcode Data:{result.CodeText}");
        }
    }