c# thread help!!

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WPF

threads

Hey

the following is my code. I am using threads to call upon a function.(the function updates a progress bar by reading in values from a log file) I need to call it 5 times, each time with diff parameters(2 parameters)..so i made a class where its object would get initialized by the two parameters. So i initialize the object in my main program and call a thread from there by passing the object. (the class has the function i need to call on the thread. But i keep getting the following error:

An object reference is required for the non-static field, method, or property 'System.Windows.Threading.Dispatcher.Invoke(System.Delegate, System.Windows.Threading.DispatcherPriority, params object[])'

this is my code for the class:

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.Shapes;
using System.Windows.Threading;
using System.Threading;

namespace EzmrSense1
{
   public class progressClass
    {
        public string file;
        public ProgressBar pbar = new ProgressBar();
        bool test = true;
        public delegate void UpdateProgressBarDelegate(System.Windows.DependencyProperty dp, object Value);
        public progressClass(string file1, ProgressBar pbar1)
        {
            file = file1;
            pbar = pbar1;
        }
        public void progressThreadFunction()
        {

            double value = 0;
            System.IO.StreamReader reader = new System.IO.StreamReader(file);
            string readerLine = reader.ReadLine();
            UpdateProgressBarDelegate UpdatePbDelegate = new UpdateProgressBarDelegate(pbar.SetValue);//delegate object
            do
            {
                readerLine = reader.ReadLine();
                value = Convert.ToInt32(readerLine);
                System.Threading.Thread.Sleep(100);
                //Dispatcher.Invoke(UpdatePbDelegate, System.Windows.Threading.DispatcherPriority.Background, new object[] { ProgressBar.ValueProperty, value });
                Dispatcher.Invoke(UpdatePbDelegate, System.Windows.Threading.DispatcherPriority.Background, new Object[] { ProgressBar.ValueProperty, value });
                
            } while (readerLine != null && test == true);
        }
    }
}

------and the main program

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.Shapes;
using System.Threading;

namespace EzmrSense1
{
	/// <summary>
	/// Interaction logic for MainWindow.xaml
	/// </summary>
	public partial class MainWindow : Window
	{
		bool test = true;
		//private delegate void UpdateProgressBarDelegate(System.Windows.DependencyProperty dp,object Value); //necc for updating progress bar
		public MainWindow()
		{
			this.InitializeComponent();
           
		}
		
        //start button code
       
        private void start(object sender, System.Windows.RoutedEventArgs e)
        {
        	// TODO: Add event handler implementation here.
			while (test == true)
            {
            progressClass myBar1 = new progressClass("C:\\Users\\Roshini\\Desktop\\emotionbar\\log2.txt",Pbar1);
            Thread newThread = new Thread(new ThreadStart(myBar1.progressThreadFunction));
            newThread.Start();   
            }
        }
        //stop button code
        private void stop(object sender, System.Windows.RoutedEventArgs e)
        {
        	// TODO: Add event handler implementation here.
			 test = false;
        }
        //exit button code
        private void exit(object sender, System.Windows.RoutedEventArgs e)
        {
        	// TODO: Add event handler implementation here.
			 Application.Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;
             Application.Current.Shutdown();
        }
	}
}

[edit]Code blocks added to preserve formatting - OriginalGriff[/edit]