Hide grid row in WPF

Row does not have a Visibility property, so as others have said, you need to set the Height. Another option is to use a converter, in case you need this functionality in many views:

    [ValueConversion(typeof(bool), typeof(GridLength))]
    public class BoolToGridRowHeightConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return ((bool)value == true) ? new GridLength(1, GridUnitType.Star) : new GridLength(0);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {    // Don't need any convert back
            return null;
        }
    }

And then in the appropriate view <Grid.RowDefinition>:

<RowDefinition Height="{Binding IsHiddenRow, Converter={StaticResource BoolToGridRowHeightConverter}}"></RowDefinition>

The best and clean solution to collapse rows or columns is to use a DataTrigger so in your case:

<Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto" MinHeight="30" />
      <RowDefinition Name="rowToHide">
        <RowDefinition.Style>
          <Style TargetType="{x:Type RowDefinition}">
            <Setter Property="Height" Value="Auto" />
            <Style.Triggers>
              <DataTrigger Binding="{Binding SomeBoolProperty}" Value="True">
                <Setter Property="Height" Value="0" />
              </DataTrigger>
            </Style.Triggers>
          </Style>
        </RowDefinition.Style>
      </RowDefinition>
      <RowDefinition Height="Auto" MinHeight="30" />
    </Grid.RowDefinitions>
  </Grid>

For reference, Visibility is a three-state System.Windows.Visibility enumeration:

• Visible - The element gets rendered and participates in layout.
• Collapsed - The element is invisible and does not participate in layout. Effectively giving it a height and width of 0 and behaving as if it doesn't exist.
• Hidden - The element is invisible but continues to participate in layout.

See this tip and other tips on the WPF Tips and Tricks thread.

You can also do this by referencing the Row in the Grid and then changing the Height of the row itself.

XAML

<Grid Grid.Column="2" Grid.Row="1" x:Name="Links">
   <Grid.RowDefinitions>
      <RowDefinition Height="60" />
      <RowDefinition Height="*" />
      <RowDefinition Height="*" />
      <RowDefinition Height="80" />
   </Grid.RowDefinitions>
</Grid>

VB.NET

If LinksList.Items.Count > 0 Then
   Links.RowDefinitions(2).Height = New GridLength(1, GridUnitType.Star)
Else
   Links.RowDefinitions(2).Height = New GridLength(0)
End If

Whilst the Collapsing of the elements within the Grid also works, this is a bit simpler if you have many items in the Grid that does not have an enclosing element that can be collapsed. This would provide a good alternative.