Raise exception when an entity has no key, and only has a foreign key to it's parent

[husseinjahan]

hi dear @bilal-fazlani

I was faced with a problem.

in this case I get an exceprion:

public class Student
{
         public int Id{get; set;}
}
public class StudentAddress
{
       [Key]
       public int StudentId{get;set;}
       public string Address{get;set;}
}

when I want to save StudentAddress, because can't find primary key

[bilal-fazlani]

What is the exception?

stacktrace ?