[C#] ดึงรูปจากฐานข้อมูล Access มาแสดงใน PictureBox ทำยังไงครับ

        private void addpic()
        {
                var con = new OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source = D:\\Project\\Visual Studio\\ระบบยืมคืน\\ระบบยืม-คืน.mdb");
                var cm = new OleDbCommand();
                cm.Connection = con;
                cm.CommandText = "Select * From Studentprofile Where CardID='" + Cardiden.Text + "'";
                OleDbDataReader dr;
                dr = cm.ExecuteReader();
                dr.Read();
                if (dr.HasRows)
                {
                    string picn = dr["IMGName"].ToString();
                    this.stdpic.SizeMode = PictureBoxSizeMode.Zoom;
                    this.stdpic.Image = Image.FromFile(picn);
                }
        }