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


    private string _getTxt;
        public string getTxt
        {
            get
            {
            var md = new Markdown();
            md.ExtraMode = true;
            md.SafeMode = false;
            _page = md.Transform(code);
            return _getTxt;
            }
            set
            {
                _getTxt= value;
            }
        }
}


##################################
XAML

<StackPanel>
  <TextBox/>
  <TextBox/>
</StackPanel>