private void btnSave_Click(object sender, EventArgs e)
        {
            System.IO.StreamWriter objSaveFile = new System.IO.StreamWriter(@"text.txt");

            objSaveFile.Write(txtData.Text);
            objSaveFile.Close();
            objSaveFile.Dispose();

            MessageBox.Show("text.txt 파일이 생성되었습니다.","텍스트 파일 완성");
        }

        private void btnRead_Click(object sender, EventArgs e)
        {
            System.IO.StreamReader objReadFile = new System.IO.StreamReader(@"text.txt");

            txtRead.Text = objReadFile.ReadToEnd();
            objReadFile.Close();
            objReadFile.Dispose();
        } 

        private void btnRead_Click(object sender, EventArgs e)
        {
            using(System.IO.StreamReader objReadFile = new System.IO.StreamReader(@"text.txt",System.Text. Encoding.Default))

            { 

                txtRead.Text = objReadFile.ReadToEnd();
                objReadFile.Close();
                objReadFile.Dispose();

            }
        }