@AndresN1 found a bug in NeuralNet(NetworkType netType, ICollection<uint> layers) where I was accessing the layers ICollection before the first element by using its IEnumerator. The MSFT docs say that an IEnumerator starts before the first element in the collection and the preferred method of using an IEnumerator is with the foreach statement. So, I changed all my ICollection iteration to use foreach.
Upgrade to v0.1.7 if you use the NeuralNet(NetworkType netType, ICollection<uint> layers) constructor. If you don't use that constructor you can safely keep using earlier versions.