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Calendar selection changed event

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'     xmlns:basics='clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls'                d:DesignWidth='640'      d:DesignHeight='480'>        <StackPanel>         <basics:Calendar Margin="3" SelectionMode="MultipleRange" SelectedDatesChanged="Calendar_SelectedDatesChanged" ></basics:Calendar>     <basics:Calendar Margin="3" DisplayMode="Year" SelectedDatesChanged="Calendar_SelectedDatesChanged" ></basics:Calendar>     <basics:DatePicker Margin="3" DateValidationError="DatePicker_DateValidationError" ></basics:DatePicker>     <basics:DatePicker Margin="3" SelectedDateFormat="Long" DateValidationError="DatePicker_DateValidationError" ></basics:DatePicker>     <TextBlock x:Name="lblError" Foreground="Red" TextWrapping="Wrap"></TextBlock>   </StackPanel> </UserControl> //File: Page.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }         private void DatePicker_DateValidationError(object sender, DatePickerDateValidationErrorEventArgs e)         {             lblError.Text = "'" + e.Text + "' is not a valid value because " + e.Exception.Message;                     }         private void Calendar_SelectedDatesChanged(object sender, SelectionChangedEventArgs e)         {                         foreach (DateTime selectedDate in e.AddedItems)             {                 if ((selectedDate.DayOfWeek == DayOfWeek.Saturday) ||                     (selectedDate.DayOfWeek == DayOfWeek.Sunday))                 {                     lblError.Text = "Weekends are not allowed";                     ((Calendar)sender).SelectedDates.Remove(selectedDate);                 }             }         }     } }