WPF

public void FadeElement(string ElementName, double currentOpacity, double targetOpacity)
{
    Storyboard Fade = new Storyboard();
    TimeSpan duration = new TimeSpan(0, 0, 0, 0, 500); // duration = 500 milliseconds
    DoubleAnimation animation = new DoubleAnimation();
    animation.From = currentOpacity;
    animation.To = targetOpacity;
    animation.Duration = new Duration(duration);
    Storyboard.SetTargetName(animation, ElementName);
    Storyboard.SetTargetProperty(animation, new PropertyPath(Control.OpacityProperty));
    Fade.Children.Add(animation);
    Fade.Begin(this);
}

//
// JAG 02/05/2008
//

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

namespace Utils.HelperClasses.WPF
{
    /// <summary>
    /// A class to create OpacityAnimations.
    /// </summary>
    public sealed class OpacityAnimation : Storyboard
    {
        #region Fields and Properties

        private Storyboard _storyboard;

        public string ElementName;

        public double CurrentOpacity;

        public double TargetOpacity;

        public OpacityAnimation()
        {
        }

        public Storyboard CreateOpacityAnimation()
        {
            _storyboard = FadeElement(ElementName, CurrentOpacity, TargetOpacity);
            return _storyboard;
        }

        private Storyboard FadeElement(string elementName, double currentOpacity, double targetOpacity)
        {
            Storyboard Fade = new Storyboard();
            TimeSpan duration = new TimeSpan(0, 0, 0, 0, 500); // duration = 500 milliseconds
            DoubleAnimation animation = new DoubleAnimation();
            animation.From = currentOpacity;
            animation.To = targetOpacity;
            animation.Duration = new Duration(duration);
            Storyboard.SetTargetName(animation, elementName);
            Storyboard.SetTargetProperty(animation, new PropertyPath(Control.OpacityProperty));
            Fade.Children.Add(animation);
            return Fade;
        }

        #endregion
    }
}

private void button1_Click(object sender, RoutedEventArgs e)
{
    OpacityAnimation oa = new OpacityAnimation();
    oa.CurrentOpacity = 1;
    oa.ElementName = "button2";
    oa.TargetOpacity = 0.3;
    oa.CreateOpacityAnimation();
    oa.Begin(this);
}

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