Set margins, by changing any existing property value for the margin in code-behind with Thickness class : Margin « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. Margin

<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

16.51.Margin
	16.51.1.	Using Margin to position elements
	16.51.2.	Set margins, by changing any existing property value for the margin in code-behind with Thickness class