public void SearchAndSelectWord(string word, int startPos, int endPos, RichTextBoxFinds type)
        {
            this.Suspend();

            if (endOfSearchingFlag)
            {
                index = this.Find(word, startPos, endPos, type);

                ReturnCarriage(ref startPos, ref endPos);

                endOfSearchingFlag = false;
            }

            var preveousIndex = index;
            index = this.Find(word, startPos, endPos, type);

            if (index == -1)
            {
                if (isFirstTimeFlag)
                {
                    ReturnCarriage(ref startPos, ref endPos);

                    index = this.Find(word, startPos, endPos, type);

                    if (index == -1)
                    {
                        var message = "Cannot find '" + LastWord + "'";
                        MessageBox.Show(message, "Terrain Constructor", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
                else
                {
                    var message = "Finish searching document.";
                    MessageBox.Show(message, "Terrain Constructor", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    index = preveousIndex;
                    endOfSearchingFlag = true;
                }
            }
            else
            {
                this.Select(index, word.Length);
                this.ScrollToCaret();
                this.isFirstTimeFlag = false;
            }

            this.Resume();
        }