Проверка правописания из кода на C# используя Microsoft Office

Исходный код примера: WordChecker.zip

#region bt_Check_Click
private void bt_Check_Click(object sender, System.EventArgs e)
{
      // текст для проверки
      string sentence =textBox1.Text;
 
      // делим текст на слова
      string[] words = sentence.Split();
 
      // класс для проверки слов
      SpellChecker checker = new SpellChecker();
 
      textBox2.Text="";
      // проверяем каждое слово
      foreach (string word in words) 
      {
            // проверка
            string[] suggestions = checker.Suggest(word);
 
            // правильно написано
            if (suggestions == null) 
            {
                  textBox2.Text+= "\""+word+"\" написано верно\r\n";
            } 
            else 
            {
                  // ошибка - предлагаем варианты
                  textBox2.Text+= "\""+word+"\" написано не верно! Варианты:\r\n";
                  foreach (string suggestion in suggestions)
                        textBox2.Text+= "\t" + suggestion+"\r\n";
            }
      }
      checker = null;
}
#endregion

using System;
using System.Collections;
using System.Reflection;
using Microsoft.Office.Interop.Word;
 
namespace SpellChecker 
{
      
      // Класс для проверки слов
      class SpellChecker 
      {
            private ApplicationClass application;
 
            public SpellChecker() 
            {
                  object template = Type.Missing;
                  object newtemplate = false;
                  object doctype = WdNewDocumentType.wdNewBlankDocument;
                  object visible = false;
 
                  // объект MS word
                  this.application = new ApplicationClass();
                  this.application.DisplayAlerts = WdAlertLevel.wdAlertsNone;
                  this.application.Visible = false;
                  this.application.Options.SuggestSpellingCorrections = true;
 
                  // создаем новый документ
                  Document document =  this.application.Documents.Add(
                     ref template, ref newtemplate, ref doctype, ref visible);
                  document.Activate();
            }
 
            ~SpellChecker() 
            {
                  // завершить word, ничего не сохраняя
                  object savenochanges = WdSaveOptions.wdDoNotSaveChanges;
                  object nothing = Missing.Value;
 
                  if (this.application != null)
                        this.application.Quit(ref savenochanges, 
                                           ref nothing, ref nothing);
                  this.application = null;
            }
 
            /// <summary>
            /// Проверка слова
            /// </summary>
            public string[] Suggest(string word) 
            {
                  object nothing = Missing.Value;
 
                  // Проверяем
                  bool spelledright = this.application.CheckSpelling(word, 
                      ref nothing, ref nothing, ref nothing, ref nothing, 
                      ref nothing, ref nothing, ref nothing, ref nothing, 
                      ref nothing, ref nothing, ref nothing, ref nothing);
 
                  if (spelledright) 
                        return null;
 
                  // получаем список слов для замены
                  SpellingSuggestions suggestions =
                       this.application.GetSpellingSuggestions(word, 
                         ref nothing, ref nothing, ref nothing, ref nothing, 
                         ref nothing, ref nothing, ref nothing, ref nothing, 
                         ref nothing, ref nothing, ref nothing, ref nothing,
                         ref nothing);
 
                  // сохраняем список слов
                  ArrayList words = new ArrayList();
                  foreach (SpellingSuggestion suggestion in suggestions)
                        words.Add(suggestion.Name);
 
                  suggestions = null;
 
                  // возвращаем массив слов
                  return (string[]) words.ToArray(typeof (string));
            }
      }
}