barcode 39 class source code

You can use LEADTOOLS Barcode Pro SDK technology in your application. You can leverage the BarcodeWriter class, which allows you to write any LEADTOOLS supported barcode type, including 3of9, to an image.

https://www.leadtools.com/sdk/products/barcode-pro

The sample code below will show how to write a 3of9 barcode to an image.

// Write/Generate Barcode using LEADTOOLS SDK
using (RasterCodecs codecs = new RasterCodecs)
using (RasterImage image = codecs.Load(@"IMAGE FILE PATH"))
{
    BarcodeEngine barcodeEngine = new BarcodeEngine();

    BarcodeData data = new BarcodeData(BarcodeSymbology.Code3Of9, "01234567890");
    data.Bounds = new LeadRect(0, 0, 400, 200);
    barcodeEngine.Writer.WriteBarcode(image, data, null);
}

Please check below link.

https://github.com/nagilum/Code39Barcode

Thanks

Please check the below detailed Article to generate barcode - 
https://www.c-sharpcorner.com/blogs/generate-barcode-and-barcode-reader-for-sale-and-purchase1

Use ITextSharp

Barcode39 code39 = new Barcode39();
code39.Code = strBarCodeValue;
code39.StartStopText = true;
code39.GenerateChecksum = false;
code39.Extended = true;

MemoryStream mem = new MemoryStream();
code39.CreateDrawingImage(System.Drawing.Color.Black, System.Drawing.Color.White)
.Save("E:\\abcd.png");

follow this

https://www.mysamplecode.com/2012/11/itext-generate-barcode-and-qrcode.html