I know this question has been asked before for earlier versions of Visual Studio Express (2010 and 2008) However I have not found a concrete answer for the same for Visual Studio Express 2012.
I plan to make some small pure C# applications which does not include any other third party libraries.
This question talks about 2010 version and VS 2012 RC but not Visual Studio Express 2012 which was released later on.
The answer to this question provides a link to an FAQ that does not exist right now. It gets redirected to a page where you can download the latest VS 2012. After some digging I was able to find an archive of that page here. Then again I can't say for sure whether it applies to VS2012 Express. Even after much digging I wasn't able to find any FAQ section for VS2012.
Next I tried to dig out the End User License terms of Microsoft products from here but I could not find license terms for VS 2012 Express edition.
I went through the licensing whitepaper for VS2012 available here. In Page 26, it states that "Visual Studio Express can be used to build production applications" Dees this mean that we can build apps/programs for commercial purposes?
From the looks of this, yes, you can use the Express edition of Visual Studio to develop commercial applications.
来源：https://stackoverflow.com/questions/13007317/can-i-use-visual-studio-2012-express-edition-for-commercial-use