# Label Strategy
When you want to fully customize the labels of your chart, you can use a label strategy to override the labels' appearance, content and layout.
## Properties
In order to use a label strategy you have to create a class inheriting from **ChartSeriesLabelStrategy**, specify the **LabelStrategyOptions** you wish to customize and override their corresponding methods. The available options are:
* **DefaultVisual**: The strategy will provide a custom visual element for each label. You have to override the **CreateDefaultVisual** method.
* **Measure**: The strategy will provide custom measurement logic for each label. You have to override the **GetLabelDesiredSize** method.
* **Content**: The strategy will provide custom content for each label. You have to override the **GetLabelContent** method. You can also override the **SetLabelContent** method used for UI virtualization and allows for reusing label content when panning and zooming.
* **Arrange**: The strategy will provide custom arrange logic for each label. You have to override the **GetLabelLayoutSlot** method.
## Example
**Examples 1, 2 and 3** will show how the default visual of the labels can be customized.
#### **Example 1: Defining the BarLabelStrategy**
```C#
public class BarLabelStrategy : ChartSeriesLabelStrategy
{
private readonly LabelStrategyOptions options = LabelStrategyOptions.DefaultVisual | LabelStrategyOptions.Measure;
public override LabelStrategyOptions Options
{
get
{
return this.options;
}
}
public override FrameworkElement CreateDefaultVisual(DataPoint point, int labelIndex)
{
var series = point.Presenter as ChartSeries;
return new Ellipse()
{
Stroke = new SolidColorBrush(Colors.Green),
Fill = series.Chart.Palette.GetBrush(point.CollectionIndex, PaletteVisualPart.Fill)
};
}
public override RadSize GetLabelDesiredSize(DataPoint point, FrameworkElement visual, int labelIndex)
{
return new RadSize(10, 10);
}
}
```
> If you use elements that do not have a desired size you have to override the **GetLabelDesiredSize** method.
#### **Example 2: Declaring the RadCartesianChart and BarSeries**
```XAML
```
#### **Example 3: Populating with data**
```C#
public class Data
{
public string Category { get; set; }
public double Value { get; set; }
}
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
List data = new List();
data.Add(new Data() { Category = "Apples", Value = 5 });
data.Add(new Data() { Category = "Oranges", Value = 9 });
data.Add(new Data() { Category = "Pineaples", Value = 8 });
this.barSeries.DataContext = data;
}
}
```
#### **Figure 1: BarSeries with custom labels**
