string addres = Application.StartupPath + "\PicStu\" + nameAx + ".jpg";


        var UpdateLINQ = (from rows in db.InfoStudents where rows.Id == Convert.ToInt32(TxtId.Text) select rows).FirstOrDefault();

        UpdateLINQ.ImageStudent = addres;
            db.InfoStudents.InsertOnSubmit(UpdateLINQ);
            db.SubmitChanges();
            MessageBox.Show("Save Sucses");
    }