private bool checkScript() { if (txtSourceSQL.Text.ToLower().Contains("drop")) { DocumentPosition position = new DocumentPosition(this.txtSourceSQL.Document); do { string word = position.GetCurrentSpanBox().Text; if (word.ToLower() == "drop") { DocumentPosition wordEndPosition = new DocumentPosition(position); wordEndPosition.MoveToCurrentWordEnd(); txtSourceSQL.Document.Selection.AddSelectionStart(position); txtSourceSQL.Document.Selection.AddSelectionEnd(wordEndPosition); } }while (position.MoveToNextWordStart()); return(true); } else { return(false); } }