public void Validate()
{
if (Name.IsNullOrEmpty())
{
throw new CustomerInvalidException("Name should not be emtpy or null");
}
if (Surname.IsNullOrEmpty())
{
throw new CustomerInvalidException("Surname should not be emtpy or null");
}
if (TelephoneNumber.IsNullOrEmpty())
{
throw new CustomerInvalidException("TelephoneNumber should not be emtpy or null");
}
if (Address.IsNull())
{
throw new CustomerInvalidException("Address should not be null");
}
Address.Validate();
}