调试易

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{    public class DEMO : Form
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }        #region Windows 窗体设计器生成的代码        /// <summary>使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.label1 = new System.Windows.Forms.Label();
            this.dateTimePicker1 = new System.Windows.Forms.DateTimePicker();
            this.SuspendLayout();
            // 
            // timer1
            // 
            this.timer1.Enabled = true;
            this.timer1.Interval = 1000;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(0, 5);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(59, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "更新日期:";
            // 
            // dateTimePicker1
            // 
            this.dateTimePicker1.CustomFormat = "yyyy年MM月dd日 HH:mm:ss";
            this.dateTimePicker1.Format = System.Windows.Forms.DateTimePickerFormat.Custom;
            this.dateTimePicker1.Location = new System.Drawing.Point(62, 0);
            this.dateTimePicker1.Name = "dateTimePicker1";
            this.dateTimePicker1.Size = new System.Drawing.Size(160, 21);
            this.dateTimePicker1.TabIndex = 1;
            this.dateTimePicker1.Value = new System.DateTime(2008, 3, 7, 12, 0, 0, 0);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(222, 21);
            this.Controls.Add(this.dateTimePicker1);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "示例.";
            this.ResumeLayout(false);
            this.PerformLayout();        }        #endregion        private System.Windows.Forms.Timer timer1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.DateTimePicker dateTimePicker1;        public DEMO()
        {
            InitializeComponent();
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            if (DateTime.Now.CompareTo(this.dateTimePicker1.Value) >= 0)
            {
                MessageBox.Show("执行自动更新");
            }
        }
    }
}

实际上你可将 Timer.Interval 的值设大一点(节省资源)...