i'm curious about your question . ain't you used their barcode reader for .net ?
http://www.keepautomation.com/products/net_barcode_reader/ ,which
Integrate advanced barcode functions into Visual Studio .NET, ASP.NET, Windows Forms projects
Completely written in Visual C#.NET, compatible with .NET 2.0 and greater versions
Scan and recognize barcodes from any directions in C#, VB class and console application
Support quick barcode scanning for multiple barcode images in one image file at a time
Decoding linear & 2d barcodes from multiple file formats and .NET image objects
Read and scan 1d & 2d barcode images in .NET, such as Code 39, Code 128, QR Code, PDF-417, etc
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