# Special Slots

`RadTimeBar` provides an easy way to mark certain intervals along the visible range of the control as special slots. This is done through a custom class, which implements the `ITimeRangeGenerator` interface. This interface defines the `GetRanges` method. Given the current visible period, this method returns `IEnumerable<IPeriodSpan>` - an array of `PeriodSpan` instances, each of which defines a special slot with a start and end date.

Below you can find a sample weekends generator implementation:

#### **Implementing the ITimeRangeGenerator in a new class**

```C#
public class WeekendsGenerator : ITimeRangeGenerator
{
	public System.Collections.Generic.IEnumerable<IPeriodSpan> GetRanges(SelectionRange<DateTime> visibleRange)
	{
		TimeSpan slotSpan = TimeSpan.FromDays(2);
		var differenceFirstVisible = DayOfWeek.Saturday - visibleRange.Start.DayOfWeek;
		DateTime day = new DateTime(visibleRange.Start.Year, visibleRange.Start.Month, visibleRange.Start.Day);

		for (DateTime current = day.AddDays(differenceFirstVisible); current < visibleRange.End; current += TimeSpan.FromDays(7))
		{
			yield return new PeriodSpan(current, slotSpan);
		}
	}
}
```

Using the `SpecialSlotsGenerator` property of the RadTimeBar control you can specify a custom `ITimeRangeGenerator` instance that defines certain time intervals as special.

The following example shows how to set the custom `WeekendsGenerator` from the above code snippet to the RadTimeBar control:

#### **Setting a custom ITimeRangeGenerator to the SpecialSlotsGenerator property of RadTimeBar**

```XAML
<telerik:RadTimeBar x:Name="timeBar">
	<telerik:RadTimeBar.Intervals>
		<telerikDataVisualization:MonthInterval/>
		<telerikDataVisualization:DayInterval/>
	</telerik:RadTimeBar.Intervals>
	<telerik:RadTimeBar.SpecialSlotsGenerator>
		<local:WeekendsGenerator/>
	</telerik:RadTimeBar.SpecialSlotsGenerator>
</telerik:RadTimeBar>
```

**RadTimeBar with custom special slots**

![RadTimeBar with custom special slots](https://www.telerik.com/winui/documentation/assets/421eeaaed1f85ce0218ac5a8148de797/radtimebar-special-slots-0.png)

## See Also

* [Intervals Formatters](https://www.telerik.com/winui/documentation/controls/radtimebar/intervals-formatter)
* [Formatter Provider](https://www.telerik.com/winui/documentation/controls/radtimebar/formatter-provider)