VB.NET UPC-A Generator Data Encoding Tutorial

sample source code to input valid data and generate linear UPC-A images in VB.NET

VB.NET UPC-A Barcode Generator is a mature linear barcode generation component designed for VB.NET developers who are necessary of adding the UPC-A barcode printing functions into their .NET projects. It is compatible with the .NET 2.0, 3.0, 3.5, 4.0 and is able to create UPC-A barcodes in ASP.NET Web projects, .NET WinForms apps as well as .NET reporting services (SSRS) projects using the Visual Basic .NET. It is simple to encode valid digits into the UPC-A barcode symbology by Visual Basic .NET.


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• Customizing UPC-A Barcode Image in Visual Basic.NET Project
• Customizing UPC-A Barcode Size in Visual Basic.NET Project

UPC-A Valid Character Set

The UPC-A barcode, also known as Universal Product Code version E, GTIN-12 with lead 0, GS1-12, UCC-12, is extensively used on consumer good in supermarket, books, magazines, and newspapers. It is a subset barcode symbol of UPC barcodes, which contain UPC-E, UPC Supplemental 2-digit add-on, and UPC Supplemental 5-digit add-on.

An UPC-A symbol is a fixed length barcode and only encodes 12 digits, which consists of 11 digits of message information and 1 check digit. UPC-A barcode only encodes numeric characters from 0 through 9:

UPC-A Character Set: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

Encode data into UPC-A using VB.NET

Sample for encoding data into UPC-A via VB.NET

Dim barcode As Linear = New Linear

barcode.Type = BarcodeType.UPCA

barcode.Data = "12345678901"

barcode.UOM = UnitOfMeasure.PIXEL

barcode.X = 1

barcode.Y = 80

barcode.LeftMargin = 0

barcode.RightMargin = 0

barcode.TopMargin = 0

barcode.BottomMargin = 0

barcode.Resolution = 96

barcode.Rotate = Rotate.Rotate0

UPC-A Barcode Symbol Components

After encoding the data string "12345678901" into an UPC-A symbol, you will get a upca barcode which looks like the following image:



An UPC-A barcode symbology is made up of four fields from the left to right:

1. System number, a single digit at the left side of the UPC-A symbol. The first digit "1" in the above UPC-A image

2. Manufacturer code, five digits assigned by the UCC Council to manufacturer or company. The digits "23456" in the above UPC-A image

3. Product code, five digits assigned by the manufacturer. The digit "78901" in the above image

4. Check digit, the last digit. Numeric "2" in the above image