public override string ToString()
        {
            Coach c1 = new Coach();

            if (Coach == null)
            {
                c1.Name = "";
            }
            else
            {
                c1.Name = coach.Name;
            }

            string result = $"Name: {name}\nAddress: {address.Street}, {address.City}, {address.Province}, {address.PostalCode}\nTelephone Number: {phoneNumber}\nRegistration Number: {clubNumber}\nSwimmmers:\n {ClubMembers()}\nCoaches: {c1.Name}\n";

            return(result);
        }
 public void AddCoach(Coach coach)
 {
     Coach      = coach;
     coach.Club = new Club(this.ClubNumber, this.Name, this.Address, this.PhoneNumber);
 }