MVC 3实体-对第一个数据库问题进行建模

Question

I am getting the following error when defining an association between my ExerciseSession and LatLons.

Basically i want a one- to- many relation between my:

1. asp_net_user -> exerciseSession
2. ExerciseSession -> LatLons

Is there a difference between an associations and a foreign key relation? and Can someone point to a tutorial which show how to create a 1 -> many relation in an existing .edmx Model Diagram?

Here is a picture to show everything that is going wrong.

Answer 1

Are you sure your foreign key have right "direction" ? From it name it looks it points from session to latlon, but from model it is obvious that it have to be in the opposite direction.