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I would like to make a program that takes input as a string like 'dsfljsfkj' then output 2D Barcode (DataMatrix format, or other 2D formats) as an image file in VB.NET

Do you have any idea how can I make it without using any other commercial .dll's? Open-source is OK.

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check out the google ZXing project:

http://code.google.com/p/zxing/

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I already found ZXing project. However, I do not know how to use in a VB.NET project ? It is said that there is partial c# port, and I dont know what it means? And I need VB.Net dll, because I need to integrate it to my project.
zxing is primarily a decoder library. It has a QR encoder (in Java, anyway) but I'm not sure it has any others
I tried to use ZXing, and after a little search I found its VB.NET classes. I actually generated 2D barcode now, and now, I am trying to draw it in a picture box !
I drow barcode to picturebox with drawing.creategraphics method. However, I need to flip it horizontally. But picturebox.Image is null. How can I fill image with drawing.graphics ?
ZXing Project solved my problem, and I successfully generated barkodes. Thanks for answers.

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