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We have all used WPF DataTemplates, but I bet most of you never gave thought to the meaning of the x:Key attribute. We all know the meaning of the DataType attribute, which determines to what type of data the template will apply to. But what about the x:Key why is it there? Lets tale a look at the following code:

<Window.Resources>
        <DataTemplate DataType="{x:Type data:s}">
            <Button Width="50" Height="50">
                <TextBlock Text="{Binding text}"></TextBlock>
            </Button>
        </DataTemplate>
    </Window.Resources>
    <Canvas>
        <ItemsControl ItemsSource="{Binding}">
        </ItemsControl>
    </Canvas>

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Often we want to display a list of elements and allow the user to sort them in various ways. There are many ways to do it and I wanted to show you how to use a SortDescription Object. What is a SortDescription object you ask? It receives two parameters in its constructor: the first is [...]


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