Looking for an open-source or low cost dev license survey / form builder application in C# or VB.NET

I am looking either a low-cost (under 500$) developer license, or open-source survey / form generator tool. It has to be written in C# or VB.NET. These are the core features I need:

Ability to generate surveys with a list of questions on the fly
Multiple answer choices (freeform text, radiobutton, etc)
Users can fill out survey online
Results are emailed to an address, or saved to a database, or both
Bonus: Logic-based question skipping (ex: if you answered yes to 15, ask why)

Thanks in advance. Also if you have any insight at all to solutions in other languages, I would be interested. I know I could write my own version of this but I would love to hack someoene elses together instead.

Solution

Perhaps a pre-built solution will suffice and save you from having to do any programming at all?

For example, SurveyMonkey