namespace WpfApplication3
{
   
    [Serializable]
    public class Task
    {
        public string ToDo { get; set; }
        public Task(){ }

    }

    [Serializable]
    public class Day
    {
        public List<Task> ListTasks { set; get; }
        public DateTime Date { get; set; }
        public Day() { }

    }

    public partial class MainWindow : Window
    {

        List<Day> lst = new List<Day>(); 

        public MainWindow()
        {
            InitializeComponent();

        }

        private void Mi3_Click(object sender, RoutedEventArgs e)
        {
            //((TextBox)((ContextMenu)((MenuItem)sender).Parent).PlacementTarget).FontStyle =???

        }

        private void Mi2_Click(object sender, RoutedEventArgs e)
        {
            ((TextBox)((ContextMenu)((MenuItem)sender).Parent).PlacementTarget).Text = "";
        }

        private void Mi1_Click(object sender, RoutedEventArgs e)
        {
            ((TextBox)((ContextMenu)((MenuItem)sender).Parent).PlacementTarget).Background = Brushes.Red;
            
        }

      
        private void Calendar_SelectedDatesChanged(object sender, SelectionChangedEventArgs e)
        {
            var calendar = sender as Calendar;
            if (calendar.SelectedDate.HasValue)
            {
                ContextMenu cm = new ContextMenu();
                MenuItem mi1 = new MenuItem();
                mi1.Header = "Importent";
                mi1.Click += Mi1_Click;
                MenuItem mi2 = new MenuItem();
                mi2.Header = "Delete";
                mi2.Click += Mi2_Click; ;
                MenuItem mi3 = new MenuItem();
                mi3.Header = "Completed";
                mi3.Click += Mi3_Click;

                cm.Items.Add(mi1);
                cm.Items.Add(mi2);
                cm.Items.Add(mi3);

                for (int i = 0; i < 16; i++)
                {
                    TextBox tb = new TextBox();
                    tb.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
                    tb.Height = 25;
                    tb.Style = (Style)this.Resources["MyRes"];
                    tb.Margin = new Thickness(2);
                    tb.ContextMenu = cm;
                    this.StEdits.Children.Add(tb);
                }


                var arDays = this.lst.Where(x => calendar.SelectedDate.Value.Date == x.Date).Cast<Day>(); //will be only one Day
    
                foreach ( var oneDay in arDays)
                {
                    int iCount = 0;
                    foreach (TextBox tb in this.StEdits.Children.Cast<TextBox>())
                        tb.Text = oneDay.ListTasks[iCount++].ToDo;

                }
              
            }

        }
        void Serialize()
        {
            try
            {
                using (FileStream fs = new FileStream("1.xml", FileMode.OpenOrCreate, FileAccess.Write))
                {
                    XmlSerializer xml = new XmlSerializer(typeof(List<Day>));
                    xml.Serialize(fs, lst);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        void Deserialize()
        {
            try
            {
                using (FileStream fs = new FileStream("1.xml", FileMode.Open, FileAccess.Read))
                {
                    XmlSerializer xml = new XmlSerializer(typeof(List<Day>));
                    this.lst = (List<Day>)xml.Deserialize(fs);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
           
            Serialize(); //??????

        }
      
    }