Progress Reporting Framework

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
using ProgressTracker;

namespace ProgessExample
{
    public partial class Form1 : Form
    {
        private List<IFibonacci> FibList = new List<IFibonacci>();
        private Binding currentProgressBinding = null;

        public Form1()
        {
            this.InitializeComponent();

            FibList.Add(new MSDNStyleFibonacci());
            FibList.Add(new TrackedFibonacci());
            comboFib.DataSource = FibList;
            textBoxParamN.Text = "30";
        }

        private void Go_Click(object sender, EventArgs e)
        {
            // If a tracked algorithm is already running, disconnect it from
            // the progress bar
            if (this.currentProgressBinding != null)
            {
                this.barProgress.DataBindings.Remove(this.currentProgressBinding);
                this.currentProgressBinding = null;
            }
                    
            
            {
                int nUpdates = 0;

                // Instantiate the newscaster object:
                NewsCaster newsCaster = new NewsCaster();

                // Optionally show the results in a diagram. Storing the data for
                // the diagrams may take some time, so expect that the algorithm will
                // take longer if this is enabled.
                if (Control.ModifierKeys == Keys.Control) newsCaster.EnableProgressResultDlg = true;

                // Add a databinding for the progress bar
                this.currentProgressBinding = this.barProgress.DataBindings.Add("Value", newsCaster, "Progress");

                // Use the ProperyChanges event for text box updates (this is just to
                // explain the difference)
                newsCaster.PropertyChanged += (_sender, _e) =>
                {
                    lblUpdates.Text = nUpdates.ToString();
                    lblTimeElapsed.Text = newsCaster.TimeElapsed.ToString();
                    lblTimeEstimated.Text = newsCaster.TimeEstimated.ToString();
                    
                    nUpdates++;
                };

                newsCaster.Finished += () => {
                    // The Finished event may be used to perform an operation in the UI
                    // thread once the tracked task finishs.
                };

                IFibonacci fib = comboFib.SelectedItem as IFibonacci;

                int paramN = Convert.ToInt32(textBoxParamN.Text);
                if (paramN < 2) paramN = 2;
                if (paramN > 40) paramN = 40;
                textBoxParamN.Text = paramN.ToString();

                ThreadPool.QueueUserWorkItem((state) =>
                {
                    // Pass the newly created root reporter to
                    // the tracked algorithm
                    fib.Compute(paramN, 
                        this.cbProgress.Checked ? 
                            newsCaster.CreateReporter()
                                :
                            null);

                    // Signal Finalization (will disallow further progress
                    // updates and will raise the Finished event in the UI thread)
                    newsCaster.Finish();
                });
            }
        }
    }
}