linq integer division convert to percentage without decimal points

((int)(((decimal)(a.Category.Sum(l => l.Quantity) : 0) / MyDividerInteger) * 100)).ToString() + "%",

windows phone 8 toolkit contextmenu change menuitem header text dynamically

MenuItem item = menu.FindName("ContextMenuItemToggleReporting") as MenuItem;// .Single(i=>((MenuItem)item).Name == "ContextMenuItemToggleReporting") as MenuItem;
            if ([you condition logic here. e.g. MyEntity.IsReportingEnabled])
            {
                item.Header = "Disable Reporting";
            }
            else
            {
                item.Header = "Enable Reporting";
            }

windows phone 8 LongListSelector with ContextMenu

* you need to import the Windows Phone Toolkit from NuGet in order to be able to use ContextMenu

in .xaml page you need this:

    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"

    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"

    xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">

            <phone:LongListSelector x:Name="MainLongListSelector" Margin="0,0,-12,0" >

                <phone:LongListSelector.ItemTemplate>

                    <DataTemplate>

                        <StackPanel Margin="0,0,0,17">

                            <toolkit:ContextMenuService.ContextMenu>

                                <toolkit:ContextMenu Name="ListItemContextMenu" Opened="ListItemContextMenu_Opened" >

                                    <toolkit:MenuItem Name="ContextMenuItemCopy" Header="Copy" Click="MenuItem_Click"/>

                                    <toolkit:MenuItem Name="ContextMenuItemEdit" Header="Edit" Click="MenuItem_Click"/>

                                    <toolkit:MenuItem Name="ContextMenuItemDelete" Header="Delete" Click="MenuItem_Click"/>

                                </toolkit:ContextMenu>

                            </toolkit:ContextMenuService.ContextMenu>

                            <TextBlock Text="{Binding DisplayString}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>

                        </StackPanel>

                    </DataTemplate>

                </phone:LongListSelector.ItemTemplate>

            </phone:LongListSelector>

        </Grid>

in .xaml.cs you need this

using System.Windows.Controls;

using System.Windows.Navigation;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Shell;

        YourViewModel selectedItem;

        private void ListItemContextMenu_Opened(object sender, RoutedEventArgs e)

        {

            ContextMenu menu = sender as ContextMenu;

            selectedItem = menu.DataContext as YourViewModel;

        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)

        {

            MenuItem menuItem = sender as MenuItem;

            if (menuItem != null && selectedItem != null)

            {

                switch (menuItem.Name)

                {

                    case "ContextMenuItemCopy":

                        ActionCopy();

                        break;

                    case "ContextMenuItemEdit":

                        ActionEdit();

                        break;

                    case "ContextMenuItemDelete":

                        ActionDelete();

                        break;

                }

            }

        }