public async Task <bool> ValidateCreateAsync(CreateSubscriberDto model)
{
model.CheckArgumentIsNull(nameof(model));
//if (string.IsNullOrWhiteSpace(model.Name))
// throw new ArgumentNullException(nameof(model.Name));
if (string.IsNullOrWhiteSpace(model.Email))
{
throw new ArgumentNullException(nameof(model.Email));
}
var subscriber = await _repository.FindByEmailAsync(model.Email);
if (subscriber != null)
{
throw new SubscriptionEmailExistException();
}
return(await Task.FromResult(true));
}