Read PDF text Arabic and English

<pre lang="cs">
try
            {
                this.textBox1.RightToLeft = RightToLeft.Yes;
                string line = null;
                System.IO.TextReader readFile = new StreamReader("C:\\net-informations.txt", Encoding.Default);
                line = readFile.ReadToEnd();
                textBox1.Text = line;
                readFile.Close();
                readFile = null;
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.ToString());
            }