private void BinhLuan_Forum_Loaded(object sender, RoutedEventArgs e)
        {
            txtbox_noidung.Text = "";
            ws         = new kidmathwebserviceSoapClient();
            dsbinhluan = ws.GetDatatraLoiForumAsync().Result.Body.GetDatatraLoiForumResult.ToList <traloiForum>();
            dsbinhluan = dsbinhluan.FindAll(binhluan => binhluan.idbaiviet == baivietduocchon.idbaiviet);
            foreach (var binhluan in dsbinhluan)
            {
                binhluan.username = '******' + binhluan.username;
            }

            grview_dsbinhluan.ItemsSource = dsbinhluan;
            ws = new kidmathwebserviceSoapClient();
            string sql_congluotview = "UPDATE mainForum SET mainForum.luotxem = mainForum.luotxem + 1 WHERE mainForum.idbaiviet = '" + baivietduocchon.idbaiviet + "';";

            ws.ThucHienLenhAsync(sql_congluotview);
        }