private void button1_Click(object sender, EventArgs e)
        {
            string str;

            if (!(openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK))
            {
                return;
            }
            StreamReader sr = new StreamReader(openFileDialog1.FileName, Encoding.GetEncoding("euc-kr"));

            XmlSerializer xs = new XmlSerializer(typeof(PhoneBook));//PhoneBook을 시리얼라이즈 할거야.

            //XmlReader rd = XmlReader.Create(sr);

            pb = (PhoneBook)xs.Deserialize(sr);

            sr.Close();

            textBox1.Text = pb.getAllData();
        }