How to animate Margin property in WPF

Question

I want to move animate an rectangle object to move it in x-axis. I am new to WPF animation, started out with the following:

Answer 1

i just created a animation. code bellow

using System;
using System.Windows;
using System.Windows.Media.Animation;

namespace ImagesSwitcher
{
    class MarginAnimation : AnimationTimeline
    {
        protected override Freezable CreateInstanceCore()
        {
            return new MarginAnimation();
        }

    public override Type TargetPropertyType => typeof(Thickness);

    private double GetContrast(double dTo,double dFrom,double process)
    {
        if (dTo < dFrom)
        {
            return dTo + (1 - process) * (dFrom - dTo);
        }

        return dFrom + (dTo - dFrom) * process;
    }

    public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock)
    {
        if (!From.HasValue || !To.HasValue || animationClock.CurrentProgress == null) return null;
        var progress = animationClock.CurrentProgress.Value;

        if (progress.Equals(0)) return null;

        if (progress.Equals(1)) return To.Value; 

        var fromValue = From.Value;
        var toValue = To.Value;

        var l = GetContrast(toValue.Left ,fromValue.Left, progress);
        var t = GetContrast(toValue.Top, fromValue.Top, progress);
        var r = GetContrast(toValue.Right, fromValue.Right, progress);
        var b = GetContrast(toValue.Bottom, fromValue.Bottom, progress);

        return new Thickness(l,t,r,b);
    }

    public Thickness? To
    {
        set => SetValue(ToProperty, value);
        get => (Thickness)GetValue(ToProperty);
    }
    public static DependencyProperty ToProperty = DependencyProperty.Register("To", typeof(Thickness), typeof(MarginAnimation), new PropertyMetadata(null));

    public Thickness? From
    {
        set => SetValue(FromProperty, value);
        get => (Thickness)GetValue(FromProperty);
    }
    public static DependencyProperty FromProperty = DependencyProperty.Register("From", typeof(Thickness), typeof(MarginAnimation), new PropertyMetadata(null));

}

}