EF 4.1 and “Collection was modified; enumeration operation may not execute.” exception

Question

This has been driving me nuts for the last 2 days. I have 3 pretty basic classes (well, reduced for readability)

public class Employee 
{
    public string N         


        

Answer 1

I've just recently come across this problem myself. What I found is that EF hates indirect circular references. In your case it seems Employer should own the relationship to employee. So take out the reference back to employer from the employee class.