ACPAddIn.ThisAddIn.getWordsBeforeLastSentence C# (CSharp) Méthode

        public string getWordsBeforeLastSentence()
        {
            string lastSentenceString = "";

            Word.Range range = Globals.ThisAddIn.Application.Selection.Range;
            range.Start = range.End;

            string temp = "";
            bool isWordBeforeLastSentence = false;
            bool isSpecialKey = false;
            bool isNewLine = false;
            bool isSpaceForLastCharacter = false;
            bool isFullStop = false;

            String[] exceptionalWords = { "mr.", "ms.", "mrs.", "mdm.",  "prof.", "dr."};

            do
            {
                // Move the start range index by one letter (left)
                // This is to check the word before the current cursor
                range.MoveStart(Word.WdUnits.wdCharacter, -1);
                temp = range.Text;

                if (temp != null)
                {
                    // Check if the word is before last sentence or at the beginning of the document (null)
                    isSpecialKey = (temp.Trim().Equals("!")
                        || temp.Trim().Equals("?")
                        || temp.Trim().Equals("."));
                    isNewLine = temp.Equals("\r");
                    isFullStop = temp.Trim().Equals(".");

                    isWordBeforeLastSentence = (!isNewLine && (!isSpecialKey || (isSpecialKey && !isSpaceForLastCharacter)));

                    if (isFullStop)
                    {
                        range.MoveStart(Word.WdUnits.wdWord, -1);
                        temp = range.Text;

                        for (int i = 0; i<exceptionalWords.Count(); i++)
                        {
                            if(temp.ToLower().Equals(exceptionalWords[i].ToLower())){
                                isWordBeforeLastSentence = true;
                                break;
                            }
                        }
                        range.End = range.Start;
                        range.MoveEnd(Word.WdUnits.wdCharacter, 1);
                    }
                }
                else
                {
                    isWordBeforeLastSentence = false;
                }

                if (isWordBeforeLastSentence)
                    lastSentenceString = temp + lastSentenceString;

                // Move the end range index by one letter (left)
                range.MoveEnd(Word.WdUnits.wdCharacter, -1);

                if (temp != null && temp.Equals(" "))
                {
                    isSpaceForLastCharacter = true;
                }
                else
                {
                    isSpaceForLastCharacter = false;
                }
            } while (isWordBeforeLastSentence);

            return lastSentenceString;
        }