# selectedIndex

> Returns or sets the selected item's index in the data source. If multiple items are selected, returns the first selected item's index. If multiple items are provided, sets them all as selected. If no item is selected, returns -1.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.UIElements](/engine/6000.5/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public int selectedIndex { get; set; }
```