public string ValidateUniqueContentId(Content contentWithUniqueId) { return((contentWithUniqueId != null) ? ValidationErrorMessages.EntityWithIdExists <Content>(contentWithUniqueId.Id) : string.Empty); }
public string ValidateUniqueAuthorId(Author authorWithUniqueId) { return((authorWithUniqueId != null) ? ValidationErrorMessages.EntityWithIdExists <Author>(authorWithUniqueId.Id) : string.Empty); }