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Barcode Professional SDK for .NET更新至v8.0，新增QR码条形码、TLC39条码、Code 49条码等多种新条码，欢迎下载体验。

Barcode ProfessioKnal SDK for .NET v7.0更新

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本次教程将向您展示如何使用Barcode Professional SDK for .NET在PDF文档中插入EAN/UPC复合型条形码，2D PDF417条形码和GS1线性条形码。

In this article, we’ll show you how to use Barcode Professional SDK for .NET along iTextSharp for inserting or stamping an EAN/UPC Composite barcode, a 2D Micro PDF417 barcode, and a linear GS1 DataBar (formerly RSS) barcode which are not part of iTextSharp library into an existing PDF document.

Most current 2D barcodes like Data Matrix, QR Code, Aztec Code, PDF417, etc; were not designed to encode Unicode two-byte characters but single-byte strings only. In general, the default character set for 2D barcodes is ISO-8859-1 Latin 1 although it is possible to use other single-byte character sets by using ECI (Extended Channel Interpretation) feature.