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copied!<pre><code> x:Key </code></pre> <p>Is used when you need to define an element in a ResourceDictionary . </p> <p>For example : a Style or some element you wan't to initalize in xaml .</p> <pre><code> <Style TargetType=Button x:Key="MyBtnStyle> ...... <myLocalNs:MyType x:Key="MyType1" /> </code></pre> <p>.</p> <pre><code> x:Name </code></pre> <p>Would be used when you wan't to eather reference an element from Your Code Behind :</p> <pre><code> <UserControl> <Grid x:Name="grid"> <Button x:Name="btn" /> </Grid> </UserControl> </code></pre> <p>in the UserControl.cs :</p> <pre><code> btn.Contnent = "Im A Button"; grid.RowDefenitions.Add(new RowDefenition()); </code></pre> <p>another case where you would use x:Name is when targeting an element in a ControlTemplate / DataTemplate / Style through Triggers , using <strong>TargetName</strong> </p> <p>For Example :</p> <pre><code><DataTemplate DataType="{x:Type h:HierarchicalNode}"> <Grid> <CheckBox x:Name="chkbox" /> </Grid> <DataTemplate.Triggers> <DataTrigger Binding="{Binding HasChildren}" Value="False"> <Setter Property="Visibility" Value="Collapsed" TargetName="chkbox"/> </DataTrigger> </DataTemplate.Triggers> </DataTemplate> </code></pre> <p>Another case is when you would wan't to bind to an element in XAML .</p> <pre><code> <UserControl> <Grid x:Name="grid"> <Button x:Name="btn" Content="{Binding ElementName=grid ,Path=Name}"/> </Grid> </UserControl> </code></pre> <p>FYI , x:Name would also be used when you want to Target elements using Interaction Triggers or VisualState's .</p>

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