# ISeriesDataAdapter.GetUnderlyingData method

Returns the text that identifies the source object of the specified data point.

**Namespace:** [`Eremex.AvaloniaUI.Charts`](../index.md)  
**Assembly:** `Eremex.Avalonia.Charts.dll`  
**NuGet Package:** [Eremex.Avalonia.Controls](https://www.nuget.org/packages/Eremex.Avalonia.Controls)

## Declaration

```csharp
public string? GetUnderlyingData(int index)
```

## Parameters

| name | type | description |
| --- | --- | --- |
| index | `int` | The zero-based index of the data point. |

## Returns

| type | description |
| --- | --- |
| `string?` | The underlying data text, or null if the adapter does not provide it. |

## See Also

* interface [ISeriesDataAdapter](../ISeriesDataAdapter.md)
* namespace [Eremex.AvaloniaUI.Charts](../index.md)

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