Entity Framework won't persist data in SQL Express (MDF)

Question

I was developing an application using Entity Framework and storing data in a .mdf database. My code can read the data, apparently it can save too, but only apparently. It ge

Answer 1

What's the type of ID ? A GUID? How do you set the ID? With NewID() as default? If that's the case, an O/R mapper can't read the ID back and will likely flag the entity as wrongly saved. Also check with SQL Profiler if you get any queries executed on the db.