InvalidOperationException when calling SaveChanges in .NET Entity framework

Question

I\'m trying to learn how to use the Entity framework but I\'ve hit an issue I can\'t solve. What I\'m doing is that I\'m walking through a list of Movies that I have and ins

Answer 1

I found the solution to this.

What happened was that when I created my table I forgot to add the primary key and set (Is Identity) property to yes. I then created my Entity model and got this error.

I went back and fixed my database table but I still hade the weird Exception. What solved the problem in the end was to remove the entity and re-create it after the table was fixed.

No more exceptions :)