WPF Limit number of lines in multi line TextBox

WPF TextBox controls do not have a property to limit the number of lines of text that can be entered into a control. Here is a bit of C# to provide the functionality

XAML

<TextBox Height="138" Name="textBox_DeliverFrom" Width="257" AcceptsReturn="True" PreviewKeyDown="textBox_DeliverFrom_PreviewKeyDown" />

C#

private void textBox_DeliverFrom_PreviewKeyDown (object sender, KeyEventArgs e)
    {
    //    Do not allow more than 8 Lines    
    if (e.Key == Key.Enter)
        {
        if (textBox_DeliverFrom.LineCount > 7)
            e.Handled = true;
        }
    }

One needs to add a PreviewKeyDown handler and ignore then Enter key if the control has reached the required limit.