Entity Framework 5, POCO objects and some discontected applications like ASP.NET. In a relationship for example many to one, EF doesn't update childs when its parent is updated.
Here is a better explanation with the EF issues for this problem.
http://stackoverflow.com/questions/3635071/update-relationships-when-saving-changes-of-ef4-poco-objects
Comments: This is currently the designed behavior of EF. There are several options for letting EF know about changes that were made to the entity while it was not being tracked and they are described very well in the Stack Overflow answer. We don't have any plans to make changes to EF in this area.
Here is a better explanation with the EF issues for this problem.
http://stackoverflow.com/questions/3635071/update-relationships-when-saving-changes-of-ef4-poco-objects
Comments: This is currently the designed behavior of EF. There are several options for letting EF know about changes that were made to the entity while it was not being tracked and they are described very well in the Stack Overflow answer. We don't have any plans to make changes to EF in this area.