private void notifyMenu_Show_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.WindowState = FormWindowState.Maximized;
                this.Show();
                this.BringToFront();
                this.Activate();
                this.Focus();
            }
            else
            {
                this.WindowState = FormWindowState.Minimized;
                this.Hide();
            }
        }

private void notifyMenu_Exit_Click(object sender, EventArgs e)
        {
            try
            {
                this.ShowInTaskbar = false;
                Portal.gc.Quit();
            }
            catch
            {
                // Nothing to do.
            }
        }

private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            notifyMenu_Show_Click(sender, e);
        }

private void MainForm_MaximizedBoundsChanged(object sender, EventArgs e)
        {
            this.Hide();
        }

/// <summary>
        /// 缩小到托盘中，不退出
        /// </summary>
        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            //如果我们操作【×】按钮，那么不关闭程序而是缩小化到托盘，并提示用户.
            if (this.WindowState != FormWindowState.Minimized)
            {
                e.Cancel = true;//不关闭程序

//最小化到托盘的时候显示图标提示信息，提示用户并未关闭程序
                this.WindowState = FormWindowState.Minimized;
                notifyIcon1.ShowBalloonTip(3000, "程序最小化提示",
                     "图标已经缩小到托盘，打开窗口请双击图标即可。",
                     ToolTipIcon.Info);
            }
        }

private void MainForm_Move(object sender, EventArgs e)
        {
            if (this == null)
            {
                return;
            }

//最小化到托盘的时候显示图标提示信息
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.Hide();
                notifyIcon1.ShowBalloonTip(3000, "程序最小化提示",
                    "图标已经缩小到托盘，打开窗口请双击图标即可。",
                    ToolTipIcon.Info);
            }
        }

 2、只允许允许一个程序实例，即使是通过虚拟桌面方式连接过来的，也是只允许一个人运行。

        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        private static void Main()
        {
            GlobalMutex();

Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

//******启动代码**********
        }

private static Mutex mutex = null;
        private static void GlobalMutex()
        {
            // 是否第一次创建mutex
            bool newMutexCreated = false;
            string mutexName = "Global\\" + "WareHouseMis";//系统名称，Global为全局，表示即使通过通过虚拟桌面连接过来，也只是允许运行一次
            try
            {
                mutex = new Mutex(false, mutexName, out newMutexCreated);
            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
                System.Threading.Thread.Sleep(1000);
                Environment.Exit(1);
            }

// 第一次创建mutex
            if (newMutexCreated)
            {
                Console.WriteLine("程序已启动");
                //todo:此处为要执行的任务
            }
            else
            {
                MessageUtil.ShowTips("另一个窗口已在运行，不能重复运行。");
                System.Threading.Thread.Sleep(1000);
                Environment.Exit(1);//退出程序
            }

}

        /// <summary>
        /// 弹出提示消息窗口
        /// </summary>
        public void Notify(string caption, string content)
        {
            Notify(caption, content, 400, 200, 5000);
        }

/// <summary>
        /// 弹出提示消息窗口
        /// </summary>
        public void Notify(string caption, string content, int width, int height, int waitTime)
        {
            NotifyWindow notifyWindow = new NotifyWindow(caption, content);
            notifyWindow.TitleClicked += new System.EventHandler(notifyWindowClick);
            notifyWindow.TextClicked += new EventHandler(notifyWindowClick);
            notifyWindow.SetDimensions(width, height);
            notifyWindow.WaitTime = waitTime;
            notifyWindow.Notify();
        }

private void notifyWindowClick(object sender, EventArgs e)
        {
            //SystemMessageInfo info = BLLFactory<SystemMessage>.Instance.FindLast();
            //if (info != null)
            //{
            //    //FrmEditMessage dlg = new FrmEditMessage();
            //    //dlg.ID = info.ID;
            //    //dlg.ShowDialog();
            //}
        }

        private string GetConditionSql()
        {
            SearchCondition condition = new SearchCondition();
            condition.AddCondition("ItemName", this.txtName.Text, SqlOperator.Like)
                .AddCondition("ItemBigType", this.txtBigType.Text, SqlOperator.Like)
                .AddCondition("ItemType", this.txtItemType.Text, SqlOperator.Like)
                .AddCondition("Specification", this.cmbSpecNumber.Text, SqlOperator.Like)
                .AddCondition("MapNo", this.txtMapNo.Text, SqlOperator.Like)
                .AddCondition("Material", this.txtMaterial.Text, SqlOperator.Like)
                .AddCondition("Source", this.txtSource.Text, SqlOperator.Like)
                .AddCondition("Note", this.txtNote.Text, SqlOperator.Like)
                .AddCondition("Manufacture", this.txtManufacture.Text, SqlOperator.Like)
                .AddCondition("ItemNo", this.txtItemNo.Text, SqlOperator.LikeStartAt);
            string where = condition.BuildConditionSql().Replace("Where", "");

return where;
        }

            string where = GetConditionSql();
            List<ItemDetailInfo> list = BLLFactory<ItemDetail>.Instance.Find(where, this.winGridViewPager1.PagerInfo);
            this.winGridViewPager1.DataSource = new WHC.Pager.WinControl.SortableBindingList<ItemDetailInfo>(list);
            this.winGridViewPager1.PrintTitle = Portal.gc.gAppUnit + " -- " + "备件信息报表";