Survey or rating system to easily plug into existing .net code?

I have an existing .N开发者_如何学GoET ecommerce app. A new client would like a built-in rating system. Rather than re-inventing the wheel I was wondering if there was one off-the-shelf, that I could easily plug into existing C# .NET code. It would need to reference a product record from the existing db.

The requirement include the ability to add questions, almost like a survey builder.

Does anyone know of a good one?

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http://www.dataillusion.com/feedbackserver/

Its not free, but looks pretty cool.