private void postTodb(object sender, RoutedEventArgs e)
        {
            mainDal      post = new mainDal();
            announcement a    = new announcement();

            a.Title    = this.titleBox.Text;
            a.Contents = this.contentBox.Text;
            DateTime d = DateTime.Now;

            a.Date = d.ToString();
            post.post(a);
            this.Close();
        }