DataGrid Rows Empty

Newbie here, but lost in DataGrid (WPF) and ItemSource List...

public MainWindow() {

        InitializeComponent();
        string item = null;

        List<Car> auta = new List<Car>();    

        //string Maker, string typer, string body_typer, string colorr, int year_of_maker, int kwr, string equip_levelr, decimal pricer, string extrasr
        auta.Add(new Car("Skoda", "Octavia", "Sedan", "White", "1999", " 110", "Classic", " 1999", "Defend-Lock"));
        //auticka.Add(new Car("Skoda", "Octavia", "Sedan", "White", 1999, 110, "Classic", 1999, "Defend-Lock"));



         GridNamedats.ItemsSource = auta;

Now DataGrid XAML:

{
 <DataGrid x:Name=" GridNamedats" Margin="0,71,0,0" SelectionChanged="DataGrid_SelectionChanged" ColumnWidth="SizeToHeader" Grid.ColumnSpan="3">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Make" Width="70"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Type" Width="70" Foreground="#FFBBBBBB"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Body Type" Width="70"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Color" Width="70" Foreground="#FFBBBBBB"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Year of Make"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="[KW]" Foreground="#FFBBBBBB"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Equip Level" Width="100"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Price [€]" Width="70" Foreground="#FFBBBBBB"/>
                <DataGridTextColumn Binding="{x:Null}" ClipboardContentBinding="{x:Null}" Header="Extras" Width="160"/>
                <DataGridTextColumn Foreground="#FFBBBBBB"/>
            </DataGrid.Columns>
        </DataGrid>

}

The issue is that DataGrid has empty cells in row. In class Car there is of course Constructor, a getters+Setters

Thank You Very Much for your Advice ! Oblud