The entity framework model will not update automatically. If you make changes to columns or tables in the database, you'll need to refresh your model.
If you open the .edmx
file and right-click in an empty space, there's an option to Update Model from Database
which will find tables and columns that have changed. I think you'll have to run your T4 code generation again after updating the model (haven't used T4 myself, so I'm not sure).