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Editorial Team
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Asked: 2026-05-28T03:22:53+00:00

xmlns:sdk=http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk Title=MainWindow Height=350 Width=525> <Grid> <sdk:TreeView Height=197 HorizontalAlignment=Left Margin=242,80,0,0 Name=treeView1 VerticalAlignment=Top Width=175 DataContext={Binding}> <sdk:TreeView.ItemTemplate>

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xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
        Title="MainWindow" Height="350" Width="525">
    <Grid>

        <sdk:TreeView Height="197" HorizontalAlignment="Left" Margin="242,80,0,0" Name="treeView1" VerticalAlignment="Top" Width="175" DataContext="{Binding}">
            <sdk:TreeView.ItemTemplate>
                <sdk:HierarchicalDataTemplate ItemsSource="{Binding Path=Childen}">
                    <StackPanel>
                        <TextBlock Text="{Binding Path=Value}"/>
                    </StackPanel>
                </sdk:HierarchicalDataTemplate>
            </sdk:TreeView.ItemTemplate>
        </sdk:TreeView>

I keep getting this error when I build the solution.

The tag ‘TreeView’ does not exist in XML namespace ‘http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk&#8217;. Line 8 Position 10.

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1 Answer

  1. Editorial Team

    In WPF you don’t need to use sdk: for TreeView. Simple put <TreeView ... this should work.

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