two way wpf datagrid binding to database

Question

HI all,

I want to bind WPF datagrid in two way. I had tried following XAML:

<Grid>
    <my:DataGrid x:Name="dataGrid"  AutoGenerateColumns="False" Margin="8">
        <my:DataGrid.Columns>
            <my:DataGridTextColumn Header="Header" Binding="{Binding pCode}" IsReadOnly="True" />
            <my:DataGridTextColumn Header="Header" Binding="{Binding pName}" IsReadOnly="True" />
            <my:DataGridTextColumn Header="Header" Binding="{Binding pStock}" IsReadOnly="True" />
            <my:DataGridTextColumn Header="Header" Binding="{Binding pGroup}" IsReadOnly="True" />
            <my:DataGridTextColumn Header="Header" Binding="{Binding pPrice, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />              
        </my:DataGrid.Columns>
    </my:DataGrid>
</Grid>

UPDATED

ProductsTableAdapters.TempTA tempTA = new WpfDataGridBinding.ProductsTableAdapters.TempTA();
Products.TempDataTable tempDT = new Products.TempDataTable();

 public Window1()
    {
        InitializeComponent();

        tempDT = tempTA.GetData();
        dataGrid.ItemsSource = tempDT;

    }

This is how I am binding to datagrid. Now I want to update DB whenever I change price filed in DataGrid. I more thing I would like to ask that i would update only row whose value has changed, not all rows.

Thanks Please code(help) me....