The ITF-14 barcode (Itf14 class) encodes GTIN-14 and is based on Interleaved 2 of 5. The following example illustrates.
Itf14 barcode = new Itf14("1234567890123"); barcode.Draw(pngFilePath, 300, ImageFormat.Png);
Dim barcode As Itf14 = New Itf14("1234567890123") barcode.Draw(pngFilePath, 300, ImageFormat.Png)