public bool CheckEmailFormat(string email = null) { if (AssignFieldOnCheck && email != null) { Email = email; } else { email = Email; } var result = _authProvider.CheckEmailFormat(email); // _emailFormatMessage = Array.Find<string>(FormatMessages, p => true); _emailFormatMessage = FormatMessages.FirstOrDefault(); if (IsChatty) { RaisePropertyChanged(nameof(IsEmailFormatOk)); } return(result); }