Model State Invalid when deployed to production enviornment

Sounds like the old "Works on my machine" problem. Check the database of both production and your development (test/acceptance?) machines. Look at validations that could easily break due to cultural differences like dates for example. Check machine language and culture settings and make sure your validations are culture-neutral.

Hopefully the above helps you out, otherwise you might want to update the question and add some more detailed info.

Good luck!

Hey Guys, I figured out a way to see what properties in the model state we actually invalid. Hope this helps somebody else....

 ICollection<modelstate> _collection = ModelState.Values;
                    foreach (ModelState _modelState in _collection)
                    {
                        ModelErrorCollection _errors = _modelState.Errors;
                        foreach (ModelError _error in _errors)
                        {
                            //write to event log etc......
                        }

                    }

</modelstate>