WPF VB.Net

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="SimpleCodeAnimation" Height="300" Width="300">
    
      
    


//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes
Imports System.Windows.Media.Animation
Namespace SimpleCodeAnimation
  Public Partial Class Window1
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()
    End Sub
    Protected Overrides Sub OnMouseDown(e As MouseButtonEventArgs)
      If e.LeftButton = MouseButtonState.Pressed Then
        Dim animate As New DoubleAnimation()
        animate.[To] = 300
        animate.Duration = New Duration(TimeSpan.FromSeconds(5))
        animate.RepeatBehavior = RepeatBehavior.Forever
        myEllipse.BeginAnimation(Ellipse.WidthProperty, animate)
      Else
        Dim animate As New DoubleAnimation()
        animate.By = 200
        animate.Duration = New Duration(TimeSpan.FromSeconds(5))
        myEllipse.BeginAnimation(Ellipse.WidthProperty, animate)
      End If
    End Sub
  End Class
End Namespace