How to get the checked items of checkboxes created dynamically and write that value to a file in WPF?

Question

I have written a WPF Application in C# to create checkboxes during runtime as the contents must be obtained from a file. The user selects the items from the checkbox. On the click of a button, all the checked items must be written to a text file. How can it be done? Is the following code correct way to create checkboxes dynamically?

CheckBox chb;

private void radioButton2_Checked(object sender, RoutedEventArgs e)

{

    //Create file

    string fp5 = @"D:\List.txt";       


    FileStream fs = new FileStream(fp5, FileMode.Open, FileAccess.Read);

    StreamReader reader = new StreamReader(fs);


    float cby = 135.0F;

    int ControlIndex=1;


    while (!reader.EndOfStream)

    {

        string line = reader.ReadLine();

        chb = new CheckBox();

        chb.Name = "Chk" + ControlIndex;

        Canvas.SetLeft(chb, 28);

        Canvas.SetTop(chb, cby);

        chb.Content = line;

        chb.IsChecked = false;

        chb.Foreground = new SolidColorBrush(Colors.Blue);

        myCanvas.Children.Add(chb);

        cby = cby + 25.0F;

        ControlIndex++;

    }

    fs.Close();

}


private void button5_Click(object sender, RoutedEventArgs e)

{

    //Create files

    string fp6 = @"D:\List2.txt";


    if (!File.Exists(fp6))

    File.Create(fp6).Close();


    /*I want to write the checked items of the checkbox chb to the text file List2.txt.

    I wanted to know how to do this */

}