get all selected items from wpf checkbox list give me error

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I have listbox with checked box as following, & it binding its data from sql server database,
, I want to get selected items value When I run this but I got this error

Unable to cast object of type 'System.Data.DataRowView' to type 'System.Windows.Controls.CheckBox'.

C#

<Window.Resources>
        <DataTemplate x:Key="NameColumnTemplate">
            <CheckBox Height="20"  FontFamily="Arial" FontSize="14"  Content="{Binding Path=PermissionDescription}" 
                      Tag="{Binding PermissionID}" HorizontalAlignment="Stretch" VerticalAlignment="Center"
                      />
        </DataTemplate>
    </Window.Resources>
<Grid>
<ListBox HorizontalAlignment="Stretch" Margin="12,12,136,21" Name="lstEmployees" 
                          VerticalAlignment="Stretch" ItemsSource="{Binding Tables[0]}"  
                          ItemTemplate="{StaticResource NameColumnTemplate}" 
                          ScrollViewer.VerticalScrollBarVisibility="Auto" removed="{x:Null}" 
                         BorderBrush="#FFAD7F30"  
                 SelectionChanged="lst_SelectionChanged" CheckBox.Click="lst_SelectionChanged"/>
<Button Content="listbox" Height="23" HorizontalAlignment="Left" Margin="214,207,0,0" Name="btnShowSelectedItems" 
                VerticalAlignment="Top" Width="75" Click="btnShowSelectedItems_Click" />
</Grid>

C#

public Window2()
       {
           InitializeComponent();
           // bind data
           lstEmployees.DataContext = SelJobsCat();
       }

private void btnShowSelectedItems_Click(object sender, RoutedEventArgs e)
       {
           foreach (CheckBox item in lstEmployees.Items)
           {
               if (item.IsChecked == true)
               {
                   System.Windows.MessageBox.Show((item.Content + " is checked."));

               }
           }
       }

       private void lst_SelectionChanged(object sender, RoutedEventArgs e)
       {
           if (e.OriginalSource is CheckBox)
           {
               lstEmployees.SelectedItem = e.OriginalSource;
           }

           if (lstEmployees.SelectedItem == null) return;
           Console.WriteLine(lstEmployees.SelectedIndex);
           Console.WriteLine(((CheckBox)lstEmployees.SelectedItem).IsChecked);
       }

where is my error please, Thanks

Posted 29-Jun-13 5:19am

Doudy_2020

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zkuzet · Answer 1 · 2013-06-29T06:33:00

Use the CheckBoxList's GetItemChecked or GetItemCheckState method

for (int i = 0; i < lstEmployees.Items.Count; i++)
  if (clbIncludes.GetItemChecked(i))
    System.Windows.MessageBox.Show((item.Content + " is checked."));
  else
    // Do unselected stuff

or if you want to only include actually checked items:

if (stEmployees.GetItemCheckState(i) == CheckState.Checked)

or listitem.selected:

foreach (ListItem listItem in lstEmployees.Items)
{
    if (listItem.Selected) {
        //do some work
    }
    else {
        //do some work
    }
}