Simple Asynchronous Background Task Processing with Progress Dialog (Silverlight Solution)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using AsyncOperation;

namespace AsyncOperation.ProgressDialogs
{
    public partial class DialogOneProgress : DefaultProgressDlg
    {
        private double _step;

        public DialogOneProgress()
        {
            InitializeComponent();
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            this.DialogResult = false;
        }

        protected override Button CancelButton
        {
            get { return this.btnCancel; }
        }

        //individual message handlers
        private void OnSetMainStatusText(string text)
        {
            this.txtMainStatus.Text = text;
        }

        private void OnInitProgress(double min, double max, double step)
        {
            prgFirst.Minimum = min;
            prgFirst.Maximum = max;
            prgFirst.Value = 0.0d;
            _step = step;
        }

        private void OnSetValue(double value)
        {
            prgFirst.Value = value;
        }

        private void OnStep()
        {
            prgFirst.Value += _step;
        }

        private void OnSetProgressStatus(string text)
        {
            txtFirstStatus.Text = text;
        }

        //public typesafe message senders
        public void SetMainStatusText(string text)
        {
            Action<string> a = new Action<string>(OnSetMainStatusText);
            PostMessage(a, text);
        }

        public void InitProgress(double min, double max, double step)
        {
            Action<double, double, double> a = new Action<double, double, double>(OnInitProgress);
            PostMessage(a, min, max, step);
        }

        public void SetValue(double value)
        {
            Action<double> a = new Action<double>(OnSetValue);
            PostMessage(a, value);
        }

        public void SetProgressStatus(string text)
        {
            Action<string> a = new Action<string>(OnSetProgressStatus);
            PostMessage(a, text);
        }

        public void Step()
        {
            Action a = new Action(OnStep);
            PostMessage(a, null);
        }
    }
}