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Canvas SetTop

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="Canvas_Positioning_Properties.Window1"     Title="Canvas Positioning Properties">   <StackPanel>     <Canvas Name="canvas1" Height="300">         <TextBlock Name="text1" FontWeight="Bold" Canvas.Left="0" Canvas.Right="0" Canvas.Top="0" Canvas.Bottom="0">A TextBlock.</TextBlock>   </Canvas>     <ListBox Grid.Column="5" Grid.Row="1" VerticalAlignment="Top" Width="60" Margin="10,0,0,0" SelectionChanged="ChangeTop">       <ListBoxItem>Auto</ListBoxItem>             <ListBoxItem>10</ListBoxItem>       <ListBoxItem>20</ListBoxItem>       <ListBoxItem>30</ListBoxItem>       <ListBoxItem>40</ListBoxItem>       <ListBoxItem>50</ListBoxItem>       <ListBoxItem>60</ListBoxItem>       <ListBoxItem>70</ListBoxItem>       <ListBoxItem>80</ListBoxItem>       <ListBoxItem>90</ListBoxItem>       <ListBoxItem>100</ListBoxItem>       </ListBox>   </StackPanel>         </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Navigation; using System.Windows.Shapes; using System.Windows.Data; namespace Canvas_Positioning_Properties {   public partial class Window1 : Window   {     public void ChangeTop(object sender, SelectionChangedEventArgs args)     {             ListBoxItem li3 = ((sender as ListBox).SelectedItem as ListBoxItem);             LengthConverter myLengthConverter = new LengthConverter();       Double db3 = (Double)myLengthConverter.ConvertFromString(li3.Content.ToString());       Canvas.SetTop(text1, db3);       Console.WriteLine(myLengthConverter.ConvertToString(Canvas.GetTop(text1)));     }   } }