Nullable property to entity field, Entity Framework through Code First

Question

Using the data annotation Required like so:

[Required]
public int somefield {get; set;}

Will set somefield to Not

Answer 1

Jon's answer didn't work for me as I got a compiler error CS0453 C# The type must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method

This worked for me though:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity().HasOptional(m => m.somefield);
    base.OnModelCreating(modelBuilder);
}