/// <summary>
        /// Initializes a new instance of the MainViewModel class.
        /// </summary>
        public SpellingWordViewModel(ISpellingWordService spellingWordService)
        {
            _spellingWordService = spellingWordService;
            _spellingWordService.GetSpellingWord(
                (item, error) =>
            {
                if (error != null)
                {
                    // Report error here
                    return;
                }

                WelcomeTitle = item.SpellWord + item.UsageSentance;
            });
        }
        /// <summary>
        /// Initializes a new instance of the MainViewModel class.
        /// </summary>
        public SpellingWordViewModel(ISpellingWordService spellingWordService)
        {
            _spellingWordService = spellingWordService;
            _spellingWordService.GetSpellingWord(
                (item, error) =>
                {
                    if (error != null)
                    {
                        // Report error here
                        return;
                    }

                    WelcomeTitle = item.SpellWord + item.UsageSentance;
                });
        }