C#

public abstract class ProgressBarDecorator : ProgressBar
    {
        protected ProgressBar m_decoratedProgressBar; // the Window being decorated

        public ProgressBarDecorator()
        {
            
        }

        public ProgressBarDecorator(ProgressBar p_decoratedProgressBar)
        {
            this.m_decoratedProgressBar = p_decoratedProgressBar;
    }

    }

    // the first concrete decorator which adds functionality
    public class NotifiableProgressBarDecorator : ProgressBarDecorator
    {

        public NotifiableProgressBarDecorator()
        {
            
        }
        public NotifiableProgressBarDecorator(ProgressBar p_decoratedProgressBar)
            : base(p_decoratedProgressBar)
        {
        }

        protected override void OnCreateControl()
        {
            base.OnCreateControl();
            this.BackColor = Color.Green;
            this.Value = 50;
        }
    }

}

T M Gray wrote:

Why are you using a control that doesn't do what you want it to?

using System;
using System.Drawing;
using System.Net.NetworkInformation;
using System.Windows.Forms;

namespace TestProgressBar
{
    public abstract class ProgressBarDecorator : ProgressBar
    {
        protected ProgressBar m_decoratedProgressBar; // the Window being decorated

        public ProgressBarDecorator()
        {

        }

        public ProgressBarDecorator(ProgressBar p_decoratedProgressBar)
        {
            this.m_decoratedProgressBar = p_decoratedProgressBar;
        }

    }

    // the first concrete decorator which adds vertical scrollbar functionality
    public class NotifiableProgressBarDecorator : ProgressBarDecorator
    {
        public long FullAmount;

        public void InformOnNewData(long p_newDelta)
        {
            float normalizedSize = Maximum - Minimum;

            if (FullAmount != 0)
            {
                int newValue = Value + (int) (p_newDelta/(float) FullAmount*normalizedSize);

                if ((Value + newValue) <= Maximum)
                {
                    Value += newValue;
                }
                else
                {
                    Value = Maximum;
                }
            }
        }

        public void Clear()
        {
            FullAmount = 0;
        }

        public NotifiableProgressBarDecorator()
        {
        }

        public NotifiableProgressBarDecorator(ProgressBar p_decoratedProgressBar)
            : base(p_decoratedProgressBar)
        {
        }
    }

    public class NetworkNotifiableProgressBarDecorator : NotifiableProgressBarDecorator
    {
        private NetworkInterface adapter;
        private Timer m_timer = new Timer();
        private long m_lastSentBytes;

        public NetworkNotifiableProgressBarDecorator()
        {
            adapter = NetworkInterface.GetAllNetworkInterfaces()[1];

            m_timer.Interval = 500;
            m_timer.Tick += onTimerTick;
        }

        public void Init(int p_totalNofBytes)
        {
            FullAmount = p_totalNofBytes;
            m_lastSentBytes = adapter.GetIPv4Statistics().BytesSent;
            m_timer.Start();
        }

        private void onTimerTick(object p_sender, EventArgs p_args)
        {
            long sentBytes = adapter.GetIPv4Statistics().BytesSent;
            if ( sentBytes - m_lastSentBytes > 0)
            {
                InformOnNewData(sentBytes - m_lastSentBytes);
            }
            m_lastSentBytes = sentBytes;
        }

        public void Stop()
        {
            m_timer.Stop();
        }
    }

}

public partial class Splash : Form
    {

        private void Splash_Load(object sender, EventArgs e)
        {
            tmrWasteTime.Start();
        }
        
        private void tmrFader_Tick(object sender, EventArgs e)
        {
            if(this.Opacity >0.01)
                this.Opacity = this.Opacity - 0.03;
            else
                kill_tmrFader();
        }

        Form1 form1;
        private void kill_tmrFader()
        {
            tmrFader.Stop();
            form1 = new Form1();
            this.Hide();
        }

        int waste;
        private void tmrWasteTime_Tick(object sender, EventArgs e)
        {
            if (waste < 2)
                waste++;
            else
                kill_tmrWasteTime();

        }

        private void kill_tmrWasteTime()
        {
            tmrWasteTime.Stop();
            tmrFader.Start();
        }

    }