The author needs to provide some more real time samples, since many of the previous ADO.NET books have already talked about the general stuff. The author also need to mention when to use DATASET, TYPED DATATSET, DATAREADER etc in a real time applications. These details are really needed now, since many developers would have already played around with ADO.NET they need to know which object to use and when it should be used.
Overall the book is good, internals of the ADO.NET has been covered indepth.