How to passing the value from reader to other Class ?

Dear All,

i had query out the data from db in text box using  reader,  May i know how to pass the value in other Class ?

For example, based on below code, after i query the data from DB, then i click other button, it will save the data in PDF file. 

   private void button2_Click(object sender, EventArgs e)
        {
            string MyConString = ConfigurationManager.ConnectionStrings["OUMConnectionString"].ConnectionString;
            using (SqlConnection connection = new SqlConnection(MyConString))
            {
                connection.Open();
                using (SqlCommand cmd = new SqlCommand("select * from StudentDetails where StudentID = @studentID;", connection))
                {
                    cmd.Parameters.AddWithValue("@studentID", studentID);
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        StringBuilder sb = new StringBuilder();
                        while (reader.Read())
                        {
                            textBox1.Text = studentID;
                            textBox2.Text = reader.GetString(2);
                            textBox3.Text = reader.GetString(3);
                            textBox4.Text = reader.GetString(4);
                            textBox5.Text = reader.GetString(5);
                            textBox6.Text = reader.GetString(6);
                            dateTimePicker1.Text = reader.GetString(7);
                            textBox7.Text = reader.GetString(8);
                            textBox8.Text = reader.GetString(9);
                            comboBox1.Text = reader.GetString(10);

                            Image<Bgr, Byte> img1 = new Image<Bgr, Byte>(Application.StartupPath + "/TrainedFaces/" + reader.GetString(11) + ".bmp");
                            Application.Idle -= new EventHandler(ProcessFrame);
                            pictureBox1.Image = img1;
                        }
                    }
                }
            }
        }

  private void button4_Click(object sender, EventArgs e)
        {
            Document document = new Document(PageSize.A4, 88f, 88f, 10f, 10f);
            iTextSharp.text.Font NormalFont = FontFactory.GetFont("Arial", 12, iTextSharp.text.Font.NORMAL, iTextSharp.text.Color.BLACK);
            PdfWriter wri = PdfWriter.GetInstance(document, new FileStream("Student.pdf", FileMode.Create));
            document.Open();


          // Pass the Reader Value here





            document.Close();

        }