The notion behind developing a sample C# code is to illustrate the basic steps need to be taken for .Net developers to build a simple QR Decoder, and show the developers how to use the famous zxing library to decode 2D barcode library in realtime, either by capturing pictures from a webcam or by uploading a static 2D barcode picture. The code uses AForge.dll as a Webcam video streaming library. Make sure to add AForge as a reference if its somehow was removed. By default this library should be included inside the .Net project.
Here is the official page Documentation.
![Sample] (http://www.itechflare.com/main/wp-content/uploads/2014/03/2dbarcode.png)