Question

public partial class MainWindow : Window
{
    public MainWindow()
    {
        this.InitializeComponent();

                SerialPort MySerialPort = new SerialPort();

                txt_1.Text = MySerialPort.BaudRate.ToString();
                txt_2.Text = MySerialPort.DataBits.ToString();
                txt_3.Text = MySerialPort.Parity.ToString().ToUpper();
                txt_4.Text = MySerialPort.StopBits.ToString().ToUpper();
                txt_5.Text = MySerialPort.Handshake.ToString();
    }
}

It’s Output will be like this.

Then i just modify the textbox values such as 7200,7,Odd,2 & Hardware.if click Update button, those values should change in my system(Below below figure).

Finally i want to change my port settings by textbox values after i clicked the update button. What should i do for that.

Answer 1

Those settings are stored in the registry at

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Ports

The values are stored in a single key as a comma-separated string.

You could use something like this then:

To read

            Microsoft.Win32.RegistryKey myKey = 
                Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Ports", true);
            string settings = myKey.GetValue("COM3:");

To write

            Microsoft.Win32.RegistryKey myKey = 
                Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Ports", true);
            myKey.SetValue("COM3:", "9600,n,8,1");

But instead of writing the hard-coded "9600,n,8,1" value, you would construct a value from the user-supplied values in your text boxes.