Entity Framework CTP 4. “Cannot insert the value NULL into column” - Even though there is no NULL value

Question

Im using EF CTP 4. I have a simple console app (for testing purposes) that is using EF to insert some data into a SQL database.

I have come to a problem where by upo

Answer 1

In my case EntityFramework generated this code inside Context.cs class:

modelBuilder.Entity(entity =>
{
    entity.Property(e => e.Id).ValueGeneratedNever(); // <= this line must remove
    ...
}

after remove this line, problem solved.