c# - NullReferenceException when saving to database with asp.net using EF

I have a movie database where I'm trying to save a genre. I have the
same project in winforms and there the code works, so it's probably something simple
that I missed.

Anyways, here is the
code:

 MovieCollectionEntities db
            = new MovieCollectionEntities();
 Genre g = new Genre();

            g.GenreName = TextBoxGenresAdd.Text;
 db.Genres.Add(g);

            db.SaveChanges();

The
error message I get
is:

System.NullReferenceException
            was unhandled by user code
 HResult=-2147467261
 Message=Object
            reference not set to an instance of an
            object.

edit: />Worth mentioning is probably that I'm using master paging and the code is from the
AddGenre.aspx.

edit2: Complete answer can be
found @ href="https://stackoverflow.com/questions/17136455/nullreferenceexception-in-dbcontext-savechanges">NullReferenceException
in DbContext.saveChanges()

class="post-text" itemprop="text">

class="normal">Answer

@Abhinav
linked to the correct page. The problem was that the aspx pages had the same names as
the entity names which made the program crash.