WPF

   public partial class Window1 : Window
    {
        public XmlDataProvider Provider { get; set; }

        public Window1()
        {
            InitializeComponent();

            Provider = new XmlDataProvider();
            Provider.Document = new XmlDocument();
            Provider.Document.LoadXml(TestXml.Test.Test());
            Provider.XPath = "Halloumi";
        }
    }


<Window x:Class="HalloumiDesigner.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300"
    DataContext="{Binding RelativeSource={RelativeSource Self}}">
    
    <Window.Resources>
        
        <HierarchicalDataTemplate DataType="Database" ItemsSource="{Binding XPath=Databases/Database}">
            <Border BorderBrush="SteelBlue"
                    BorderThickness="2"
                    Background="AliceBlue">
                <TextBlock Text="{Binding XPath=@Name}" />
            </Border>
        </HierarchicalDataTemplate>

    </Window.Resources>
    
    <Grid>
        <TreeView Name="TreeView" ItemsSource="{Binding Provider}" Margin="10" />
    </Grid>
</Window>

<Halloumi>
                   <Databases>
                       <Database Name="A"/>
                       <Database Name="B"/>
                   </Databases>
               </Halloumi>