C#

<Grid>
        <Button x:Name="button" Content="Copy" HorizontalAlignment="Left" Height="39" Margin="10,10,0,0" VerticalAlignment="Top" Width="110"/>
        <Grid HorizontalAlignment="Left" Height="287" Margin="138,10,0,0" VerticalAlignment="Top" Width="370">
            <TextBlock x:Name="textBlock" HorizontalAlignment="Left" Height="22" Margin="10,10,0,0" TextWrapping="Wrap" Text="Enter your age:" VerticalAlignment="Top" Width="87"/>
            <TextBox x:Name="textBox" HorizontalAlignment="Left" Height="22" Margin="113,10,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="247"/>
        </Grid>

    </Grid>

public partial class MainWindow : Window
   {
       public MainWindow()
       {
           InitializeComponent();
       }

       private void button_Click(object sender, RoutedEventArgs e)
       {
           // I can achieve this with 2 list and a zip then easily building the stringbuilder or string.
           // Trying to see if a more efficient way to bind the textblock text and textbox entered text in xml
       }
   }

List<string> periods = new List<string>();
                 periods.Add("2010 FYA");
                 periods.Add("2011 FYA");
                 periods.Add("2012 FYA");
                 periods.Add("2013 FYA");
                 periods.Add("1Q 2014A");
                 periods.Add("2Q 2014A");
                 periods.Add("3Q 2014A");
                 periods.Add("4Q 2014A");
                 periods.Add("2014 FYA");
        
                 var xx = periods.Where(a => a.ToString() == "2010 FYA" && a.ToString() == "3Q 2014A").ToList();