窗体最小化时，不挡住任务栏

 /// <summary>
        /// 窗体最小化时，隐藏到系统托盘
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MainFace_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.Hide();
                this.notifyIcon1.Visible = true;
            }
        }

        private void notifyIcon1_Click(object sender, EventArgs e)
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Maximized;
            this.MaximumSize = new System.Drawing.Size(Screen.PrimaryScreen.WorkingArea.Width,Screen.PrimaryScreen.WorkingArea.Height+6);
            this.notifyIcon1.Visible = false;
        }

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窗体最小化时，不挡住任务栏

原文：http://www.cnblogs.com/markli/p/3708761.html