I guess the code is already doing this. Is it not working properly? Here's the code I found in the Create New procedure:
articleInfo.Title = item.Title;
articleInfo.ArticleText = HttpUtility.HtmlEncode(item.Content);
articleInfo.CreatedDate = DateTime.Now;
articleInfo.AuthorID = userInfo.UserID;
articleInfo.Summary = HttpUtility.HtmlEncode(item.Summary);