Data Binding

Question

Hi!

I have a problem with databinding. I made 2 datagrid. The 1st is a general WPF dagrid the 2nd is dxgrid control.
Both show the datas through entity framework.
I wanted to bind a current row to a texbox. If I click the row in a 1st table is working well and the data is showing in the textbox, but in the 2nd grid control not working.
What cause the problem?

This is the XAML code:

<Window x:Class="Valinor.MainWindow"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="MainWindow" Height="685" Width="895" Loaded="Window_Loaded" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:my="clr-namespace:Valinor" xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid">
  <Window.Resources>
  <CollectionViewSource x:Key="itemsViewSource" d:DesignSource="{d:DesignInstance my:items, CreateList=True}" />
  </Window.Resources>
 
  <StackPanel>
  <DataGrid AutoGenerateColumns="False" EnableRowVirtualization="True" Height="200" ItemsSource="{Binding Source={StaticResource itemsViewSource}}" Name="itemsDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" Width="400">
  <DataGrid.Columns> 
  <DataGridTextColumn x:Name="item_nameColumn" Binding="{Binding Path=item_name}" Header="item name" Width="SizeToHeader" /> 
  </DataGrid.Columns>
  </DataGrid>
  <dxg:GridControl Name="grid" Height="232" Width="398" ItemsSource="{Binding Source={StaticResource itemsViewSource}}" AutoPopulateColumns="True">
  <dxg:GridControl.View>
  <dxg:TableView />
  </dxg:GridControl.View>
  <dxg:GridControl.Columns>
  <dxg:GridColumn Name="col1" DisplayMemberBinding="{Binding Path=item_name}" Header="name" />
  </dxg:GridControl.Columns>
  </dxg:GridControl>
  <Grid DataContext="{StaticResource itemsViewSource}" HorizontalAlignment="Left" Name="grid1" VerticalAlignment="Top">
  <Grid.ColumnDefinitions>
  <ColumnDefinition Width="Auto" />
  <ColumnDefinition Width="Auto" />
  </Grid.ColumnDefinitions>
  <Grid.RowDefinitions> 
  <RowDefinition Height="Auto" />
  </Grid.RowDefinitions>
  <Label Content="item name:" Grid.Column="0" Grid.Row="0" HorizontalAlignment="Left" Margin="3" VerticalAlignment="Center" />
  <TextBox Grid.Column="1" Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="3" Name="item_nameTextBox" Text="{Binding Path=item_name, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" VerticalAlignment="Center" Width="120" />
  </Grid>
  </StackPanel>
</Window>

This is a c# code:

  public partial class MainWindow : Window
  {

  public MainWindow()
  {
  InitializeComponent();
  }

  private void Window_Loaded(object sender, RoutedEventArgs e)
  {
  Valinor.ValinorEntities valinorEntities = new Valinor.ValinorEntities();
  System.Windows.Data.CollectionViewSource itemsViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("itemsViewSource")));
  System.Data.Objects.ObjectQuery<Valinor.items> itemsQuery = this.GetitemsQuery(valinorEntities);
  itemsViewSource.Source = itemsQuery.Execute(System.Data.Objects.MergeOption.AppendOnly);
  }

  private System.Data.Objects.ObjectQuery<items> GetitemsQuery(ValinorEntities valinorEntities)
  {
  System.Data.Objects.ObjectQuery<Valinor.items> itemsQuery = valinorEntities.items;
  return itemsQuery;
  }
  }