C# backgroundworker: Send new data object on each ReportProgress

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Collections.ObjectModel;

namespace WpfLongThread
{
    public partial class MainWindow : Window
    {
        ObservableCollection<Currency> currencies = new ObservableCollection<Currency>();
        public ObservableCollection<Currency> Currencies { get { return currencies; } }

        private BackgroundWorker bw = new BackgroundWorker();

        public MainWindow()
        {
            currencies = new ObservableCollection<Currency>();
            currencies.Add(new Currency { Name = "TST", Rate = 987.654321M, Description = "Initial dummy testdata" });
            InitializeComponent();
            bw.WorkerReportsProgress = true;
            bw.WorkerSupportsCancellation = true;
            bw.DoWork += new DoWorkEventHandler(bw_DoWork);
            bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
            bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
        }
        private void Thread_Click(object sender, RoutedEventArgs e)
        {
            if (bw.IsBusy == true)
            {
                this.statusText.Text = "Already running: Please wait";
                return;
            }
            while (currencies.Count > 0) {
                currencies.RemoveAt(0);
            }
            bw.RunWorkerAsync();

        }
        private void Cancel_Click(object sender, RoutedEventArgs e)
        {
            if (bw.WorkerSupportsCancellation == true && bw.IsBusy == true)
            {
                bw.CancelAsync();
                return;
            }
            this.statusText.Text = " ";
        }
        private void bw_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            System.Threading.Thread.Sleep(200);
            worker.ReportProgress(-5, "initializing... ...");
            System.Threading.Thread.Sleep(700);
            worker.ReportProgress(-1, "running ... ...");

            for (decimal i = 1; (i <= 20); i++)
            {
                if ((worker.CancellationPending == true))
                {
                    e.Cancel = true;
                    break;
                }
                else
                {
                    // Perform a time consuming operation and report progress.
                    System.Threading.Thread.Sleep(700);
                    string no2 = i.ToString("00");
                    Currency tempCurr = new Currency() { Name = "C" + no2, Rate = 10+5*i-(i/7) , Description = "Description no " + no2 };
                    worker.ReportProgress((int)(i * 5), tempCurr);
                }
            }
        }
        private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            if (e.ProgressPercentage < 0)
            {
                this.statusText.Text = e.UserState.ToString();
                return;
            }

            this.statusText.Text = e.ProgressPercentage.ToString() + "% ";

            if (e.UserState.GetType() == typeof(WpfLongThread.Currency))
            {
                currencies.Add((Currency)(e.UserState));
            }
        }

        private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if ((e.Cancelled == true))
            {
                this.statusText.Text = "Canceled!";
            }

            else if (!(e.Error == null))
            {
                this.statusText.Text = ("Error: " + e.Error.Message);
            }

            else
            {
                this.statusText.Text = "Done!";
            }
        }
        private void AddRow_Click(object sender, RoutedEventArgs e)
        {
            this.statusText.Text = " ";
            currencies.Add(new Currency { Name = "ABC", Rate = 123.456789M, Description = "From Add button at " + DateTime.Now });
        }
    }

    public sealed class Currency
    {
        public string Name { get; set; }
        public string Description { get; set; }
        public decimal Rate { get; set; }

        public string NameAndDescription
        {
            get { return Name + " " + Description; }
        }

        public string RateDec6String
        {
            get  { return Rate.ToString("N6"); }
        }
    }
}