ModelState is valid with null model

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I had the same problem before and the answer is already available in a few forums and even here at SO: ModelState.IsValid even when it should not be?

You can also add a custom filter to validate (invalidate) missing fields and/or null values
http://www.asp.net/web-api/overview/formats-and-model-binding/model-validation-in-aspnet-web-api

http://www.strathweb.com/2012/10/clean-up-your-web-api-controllers-with-model-validation-and-null-check-filters/

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