Question

I have a entity property defined as follows

 public virtual string Subject { get; set; }

and its mapped as

 this.Property(t => t.Subject)
                .IsRequired()
                .HasMaxLength(255);

but this does not provide validation for empty strings. Can i specify following constraint using fluent api ?

[Required(AllowEmptyStrings=false)]
        public virtual string Subject { get; set; }

Answer 1

No you cannot because fluent-api describes mapping to database whereas the attribute with not allowed empty strings describes validation. Only subset of validation rules can be translated to mapping.