void findAccountByRFID(string qrCode = "")
        {
            try
            {
                DataClasses1DataContext db = new DataClasses1DataContext(Tool.ConnectionString);
                var i = db.AccountSelectByRFID(qrCode).FirstOrDefault();
                this.Tag = i.cn;

                string gs = i.GradeSection_;
                if (gs.Contains("OTHER"))
                {
                    gs = i.GradeSectionOther;
                }
                pb.Image             = Tool.bytetoimage(i.AVATAR.ToArray());
                lblName.Text         = i.AccountName;
                lblLrn.Text          = i.LRN;
                lblGradeSection.Text = gs;
                PhoneNo = i.PhoneNo;
                lblUseFingerprint.Visible = true;
                lblUseFingerprint.Text    = "Scan Fingerprint to confirm.";
            }
            catch (Exception e)
            {
                lblUseFingerprint.Visible = false;
                Console.WriteLine(e.Message);
                return;
            }
        }