怎么用.net做进度条呀？

using System;

using System.Collections.Generic;

using System.Windows.Forms;

using System.ComponentModel;

using System.Drawing;



class FibonacciNumber : Form

{

	[STAThread]

	static void Main()

	{

		Application.EnableVisualStyles();

		Application.Run(new FibonacciNumber());

	}



	private StatusStrip progressStatusStrip;

	private ToolStripProgressBar toolStripProgressBar;

	private NumericUpDown requestedCountControl;

	private Button goButton;

	private TextBox outputTextBox;

	private BackgroundWorker backgroundWorker;

	private ToolStripStatusLabel toolStripStatusLabel;

	private int requestedCount;



	public FibonacciNumber()

	{

		Text = "Fibonacci";

		

		// Prepare the StatusStrip.

	    progressStatusStrip = new StatusStrip();

		toolStripProgressBar = new ToolStripProgressBar();

		toolStripProgressBar.Enabled = false;

		toolStripStatusLabel = new ToolStripStatusLabel();

		progressStatusStrip.Items.Add(toolStripProgressBar);

		progressStatusStrip.Items.Add(toolStripStatusLabel);



		FlowLayoutPanel flp = new FlowLayoutPanel();

		flp.Dock = DockStyle.Top;



		Label beforeLabel = new Label();

		beforeLabel.Text = "Calculate the first ";

		beforeLabel.AutoSize = true;

		flp.Controls.Add(beforeLabel);

		requestedCountControl = new NumericUpDown();

		requestedCountControl.Maximum = 1000;

		requestedCountControl.Minimum = 1;

		requestedCountControl.Value = 100;

		flp.Controls.Add(requestedCountControl);

		Label afterLabel = new Label();

		afterLabel.Text = "Numbers in the Fibonacci sequence.";

		afterLabel.AutoSize = true;

		flp.Controls.Add(afterLabel);

		

		goButton = new Button();

		goButton.Text = "&Go";

		goButton.Click += new System.EventHandler(button1_Click);

		flp.Controls.Add(goButton);



		outputTextBox = new TextBox();

		outputTextBox.Multiline = true;

		outputTextBox.ReadOnly = true;

		outputTextBox.ScrollBars = ScrollBars.Vertical;

		outputTextBox.Dock = DockStyle.Fill;



		Controls.Add(outputTextBox);

		Controls.Add(progressStatusStrip);

		Controls.Add(flp);



		backgroundWorker = new BackgroundWorker();

		backgroundWorker.WorkerReportsProgress = true;

		backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);

		backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);

		backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);

		

	}





	private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

	{

		// This method will run on a thread other than the UI thread.

		// Be sure not to manipulate any Windows Forms controls created

		// on the UI thread from this method.

		backgroundWorker.ReportProgress(0, "Working...");

		Decimal lastlast = 0;

		Decimal last = 1;

		Decimal current;

		if (requestedCount >= 1)

		{ AppendNumber(0); }

		if (requestedCount >= 2)

		{ AppendNumber(1); }

		for (int i = 2; i < requestedCount; ++i)

		{

			// Calculate the number.

			checked { current = lastlast + last; }

			// Introduce some delay to simulate a more complicated calculation.

			System.Threading.Thread.Sleep(100);

			AppendNumber(current);

			backgroundWorker.ReportProgress((100 * i) / requestedCount, "Working...");

			// Get ready for the next iteration.

			lastlast = last;

			last = current;

		}





		backgroundWorker.ReportProgress(100, "Complete!");

	}



	private delegate void AppendNumberDelegate(Decimal number);

	private void AppendNumber(Decimal number)

	{

		if (outputTextBox.InvokeRequired)

		{ outputTextBox.Invoke(new AppendNumberDelegate(AppendNumber), number); }

		else

		{ outputTextBox.AppendText(number.ToString("N0") + Environment.NewLine); }

	}

	private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)

	{

		toolStripProgressBar.Value = e.ProgressPercentage;

		toolStripStatusLabel.Text = e.UserState as String;

	}



	private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

	{

		if (e.Error is OverflowException)

		{ outputTextBox.AppendText(Environment.NewLine + "**OVERFLOW ERROR, number is too large to be represented by the decimal data type**"); }

		toolStripProgressBar.Enabled = false;

		requestedCountControl.Enabled = true;

		goButton.Enabled = true;



	}



	private void button1_Click(object sender, EventArgs e)

	{

		goButton.Enabled = false;

		toolStripProgressBar.Enabled = true;

		requestedCount = (int)requestedCountControl.Value;

		requestedCountControl.Enabled = false;

		outputTextBox.Clear();

		backgroundWorker.RunWorkerAsync();

	}

}

补充：.NET技术 ,  C#

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