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 class ShopRanking
    {
...
        private byte _verfuegbar;
        public byte Verfuegbar
        {
            get { return _verfuegbar; }
            set { _verfuegbar = value; }
        }
...
}                    

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Dictionary<int, ShopRanking> _shoprank = new Dictionary<int, ShopRanking>();                    

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...

<ObjectDataProvider x:Key="DatenRangliste" />
        <ObjectDataProvider x:Key="DatenPosition" />
        <DataTemplate x:Key="LayoutShoprangliste">
            <Grid>
            <TextBlock HorizontalAlignment="Left" Margin="5,0,0,4" Height="21" Width="50" Text="{Binding Path=RankNr}" />
            <TextBlock HorizontalAlignment="Left" Margin="25,0,0,4" Height="21" Width="250" Text="{Binding Path=Title}"/>
            <TextBlock HorizontalAlignment="Left" Margin="350,0,0,4" Height="21" Width="120" Text="{Binding Path=Preis}"/>
            <TextBlock HorizontalAlignment="Left" Margin="400,0,0,4" Height="21" Width="50" Text="sFr."/>
            <TextBlock HorizontalAlignment="Left" Margin="450,0,0,4" Height="21" Width="120" Text="{Binding Path=Versandpreis}"/>
            <TextBlock HorizontalAlignment="Left" Margin="500,0,0,4" Height="21" Width="50" Text="sFr."/>
            <TextBlock HorizontalAlignment="Left" Margin="550,0,0,4" Height="21" Width="50" Text="{Binding Path=Verfuegbar}"/>
            <TextBlock HorizontalAlignment="Left" Margin="600,0,0,4" Height="21" Width="120" Text="{Binding Path=Haendler}"/>
                <Image HorizontalAlignment="Left" Width="19" Height="19" Margin="550,0,0,4" Source="images/1.gif" />
            </Grid>
        </DataTemplate>

...

            <Grid Margin="0,0,0,0">
                <ItemsControl Margin="0,0,0,0"  ItemsSource="{Binding Source={StaticResource DatenPosition}}" ItemTemplate="{StaticResource LayoutPosition}" />
            </Grid>