I don't know why I can't read on sqlreader

private void btnSearch_Click(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("Data Source=YONGCHEOL;Initial Catalog=ADO;Integrated Security=True");```

           conn.Open();

            string suzy = "SELECT * FROM rankTBL where NAME='" + txtName+ "' AND CLASS='" + ClassNum+ "'";
            SqlCommand cmd = new SqlCommand(suzy, conn);
            SqlDataReader suzyread = cmd.ExecuteReader();

            if (suzyread.Read())
            {
                kor = suzyread.GetInt16(3);
                lbEng.Text = kor.ToString();
            }
            else
            {
                MessageBox.Show ("Can't Read");
            }

            suzyread.Close();
            conn.Close();
        }