This example demonstrates how to programmatically add a unique barcode header stamp to every page of a PDF document using C# and Aspose.PDF for .NET. This technique is useful for document tracking, version control, or integrating with scanning systems that rely on machine-readable identifiers. Each page receives a Code128 barcode encoding its page number, placed consistently in the header region.

Steps to Add Barcode Header Stamp to PDF Pages using C#

1. Load the source PDF document using the Document class from Aspose.Pdf.
2. Iterate through each page in the document using 1-based indexing.
3. Define a rectangle area at the top of each page to position the barcode header.
4. Create a BarcodeField instance for the current page and add it to the page’s Annotations collection.
5. Generate a Code128 barcode encoding the page number using the AddBarcode method.
6. Optionally adjust barcode appearance properties such as height and width.
7. Save the modified document to a new output file using the Save method.

Code to Add Barcode Header Stamp to PDF Pages using C#

This example shows how to embed a unique, machine-readable barcode header on each page of a PDF, enabling reliable page identification and integration with downstream workflows.