I need to reference the ZXing library to scan QR codes in my Windows Phone 8 app. I have downloaded the ZXing.Net 0.10.0.0 from the following source: http://zxingnet.codeple
Right click on the DLL in File Explorer --> Click Properties --> Choose unblock. Then try to add a reference again.
VS2012 has the absolute worst error message for when DLLs are blocked due to the fact they were downloaded from the web.
Goto http://nuget.org/packages/ZXing.Net
Follow the instructions to install the right version you need.