form1.cs

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace progBarApp
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
        private System.Timers.Timer timer1;
        private System.Windows.Forms.ProgressBar progressBar1;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.timer1 = new System.Timers.Timer();
			this.progressBar1 = new System.Windows.Forms.ProgressBar();
			((System.ComponentModel.ISupportInitialize)(this.timer1)).BeginInit();
			this.SuspendLayout();
			// 
			// timer1
			// 
			this.timer1.Enabled = true;
			this.timer1.Interval = 1000;
			this.timer1.SynchronizingObject = this;
			this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Elapsed);
			// 
			// progressBar1
			// 
			this.progressBar1.Location = new System.Drawing.Point(40, 88);
			this.progressBar1.Maximum = 200;
			this.progressBar1.Name = "progressBar1";
			this.progressBar1.Size = new System.Drawing.Size(200, 20);
			this.progressBar1.Step = 20;
			this.progressBar1.TabIndex = 1;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(280, 189);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.progressBar1});
			this.Name = "Form1";
			this.Text = "使用进度条";
			((System.ComponentModel.ISupportInitialize)(this.timer1)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
		{
			if (progressBar1.Value >= 200 )
			{
				progressBar1.Value = 0;
				return;
			}
			progressBar1.Value += 20;
		}
	}
}