Microsoft Visual Studio License

Question

I developed a small winforms application for myself in Microsoft Visual Studio 2008 Professional Edition in my workplace; Visual Studio is licensed for the company I work for.

If I want to sell this application, what are my license options?

EDIT:
The problem here is not in my relationship with my employer (the code was written in a few hours, we have an understanding), but my relationship with Microsoft.
Ex. if I continue developing in Visual Studio Express, can I save my old code? Is there any way to check if some assemblies were written using Visual Studio Professional?

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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Answer 7

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Finally, if you want to be very careful, just download the SDK, compile your code on the command line before distributing your code.

Answer 8

Learn EULA on VS Professional. You must be able to distinguish between what you can and cannot do from there. Compare this with EULA for Express. This is tiring, but it is the right place to start.