Biblioteca.Dominio.Livro.operator C# (CSharp) Method

            public static bool operator ==(Livro lhs, Livro rhs)
            {
                // Check for null on left side. 
                if (Object.ReferenceEquals(lhs, null))
                {
                    if (Object.ReferenceEquals(rhs, null))
                    {
                        // null == null = true. 
                        return true;
                    }

                    // Only the left side is null. 
                    return false;
                }
                // Equals handles case of null on right side. 
                return lhs.Equals(rhs);
            }