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Updated the README.md file #1

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**[View document in Syncfusion Xamarin Knowledge base](https://www.syncfusion.com/kb/12255/how-to-work-with-expandable-multi-level-xamarin-forms-listview-sflistview)**

## Sample

```xaml
<listView:SfListView x:Name="outerListView" ItemsSource="{Binding ContactInfo}" AutoFitMode="DynamicHeight">
<listView:SfListView.ItemTemplate>
<DataTemplate>
<Grid BackgroundColor="#f4f4f2" >
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<code>
. . .
. . .
<code>
<listView:SfListView x:Name="innerListView" Margin="5" Grid.Row="1" IsScrollingEnabled="False" IsVisible="{Binding IsInnerListVisible}" ItemsSource="{Binding ContactDetails}" AutoFitMode="DynamicHeight">
<listView:SfListView.ItemTemplate>
<DataTemplate>
<Grid x:Name="grid" RowSpacing="1" BackgroundColor="#bbbfca">
<Grid.RowDefinitions>
<RowDefinition Height="70" />
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<code>
. . .
. . .
<code>
<listView:SfListView x:Name="SubListView" IsVisible="{Binding IsSubListVisible}" Margin="5" ItemsSource="{Binding Members}" Grid.Row="1" HeightRequest="{Binding Converter={StaticResource heightConverter}, ConverterParameter={x:Reference SubListView}}" ItemSize="50" BackgroundColor="#f4f4f2">
<listView:SfListView.ItemTemplate>
<DataTemplate>
<Grid Padding="10,0,0,0">
<Label Text="{Binding Name}" VerticalOptions="CenterAndExpand"/>
</Grid>
</DataTemplate>
</listView:SfListView.ItemTemplate>
</listView:SfListView>
</Grid>
</DataTemplate>
</listView:SfListView.ItemTemplate>
</listView:SfListView>
</Grid>
</DataTemplate>
</listView:SfListView.ItemTemplate>
</listView:SfListView>
```