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Set margins, by changing any existing property value for the margin in code-behind with Thickness class

<StackPanel Name="root"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="WpfApplication1.FEMarginProgrammatic">   <StackPanel.Resources>       <Style TargetType="Button">         <Setter Property="Height" Value="25"/>         <Setter Property="Width" Value="250"/>         <Setter Property="HorizontalAlignment" Value="Left"/>         <Setter Property="FontSize" Value="20"/>           </Style>   </StackPanel.Resources>   <Button Click="OnClick" Margin="10" Name="btn1">Click To See Change!!</Button> </StackPanel> //File:Window.xaml.vb Imports System Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Media Namespace WpfApplication1   Public Partial Class FEMarginProgrammatic     Private Sub OnClick(sender As Object, e As RoutedEventArgs)       Dim marginThickness As Thickness = btn1.Margin       If marginThickness.Left = 10 Then         btn1.Margin = New Thickness(60)       Else         btn1.Margin = New Thickness(10)       End If     End Sub   End Class End Namespace