linq concatenate rows

we can use Aggregate methods to concatenate fields in rows as follow:

        var profiles = (from b in invoiceContext.bills
                        join p in invoiceContext.PaymentProfiles on 1 equals 1
                       where  b.ProfileID == p.Id || b.ProfileType == p.Id
                           select p.Name).ToList();

        if (profiles.Count() > 0)
        {
            BillingMethodLabel.Text = profiles.Aggregate((current, next) => current + ", " + next);
        }