Writing lines from Text file to Serial Port

   private void Submitbtn_Click(object sender, EventArgs e)
    {
        String Hostname = Clientnametbx.Text + Locationcodelbx.Text;
        String Client = Clientnametbx.Text;
        String Hostfile = ((@"c:\clients\" + Client) + (@"\" + Hostname + ".txt"));

        if (Textfilerbtn.Checked)
        {
      //Opens the .TXT File to allow copy to the system//
            Configuration();
            System.Diagnostics.Process.Start((@"c:\clients\" + Client) + (@"\" + Hostname + ".txt"));
        }
        if (Commportrbtn.Checked)
            // Writes configurations to the serial port on the computer//
        {
            Configuration();
            string Portconfiguration = "com" + CommPortbtn.Text;
            SerialPort port = new SerialPort(Portconfiguration, 9600, Parity.None, 8, StopBits.One);

            // Open the port for communications//
            port.Open();

            //Write Configuration file to System
            using (StreamReader config = new StreamReader(Hostfile))
            {
              port.Write(File.OpenText(Hostfile).ReadToEnd());
             }

            //Close the port//
            port.Close();
            System.Diagnostics.Process.Start((@"c:\clients\" + Client) + (@"\" + Hostname + ".txt"));

            MessageBox.Show("Please review the system configuration on the system");
        }
        else
        {
        }
        }
   }
}