//最小化　→　正常
        private void MinimizedToNormal()
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
            显示ToolStripMenuItem.Text = "隐藏窗口";
        }
        //正常　→　最小化
        private void NormalToMinimized()
        {
            this.WindowState = FormWindowState.Minimized;
            this.Visible = false;
            显示ToolStripMenuItem.Text = "显示窗口";
        }

    //界面点击X关闭后 取消关闭 最小化
        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.NormalToMinimized();
            e.Cancel = true;
        }
//双击右下角图标时 会调用的notifyIcon控件的鼠标双击事件
        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (this.WindowState == FormWindowState.Minimized)//当窗口是最小化时。
                {
                    this.MinimizedToNormal();
                }
                else if (this.WindowState == FormWindowState.Normal)//当窗口是最大化时。
                {
                    this.NormalToMinimized();
                }

            }
        }

------解决方案--------------------

第一个功能我自己是这样的，不知道有没有更好的办法。同求。
C# code
//窗体 鼠标拉动
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;

    //界面MouseDown事件
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

    //界面MouseMove事件
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (this.Location.X < 0)
            {
                this.Location = new Point(0, this.Location.Y);
            }
            if (this.Location.X > System.Windows.Forms.SystemInformation.WorkingArea.Width - this.Size.Width)
            {
                this.Location = new Point(System.Windows.Forms.SystemInformation.WorkingArea.Width - this.Size.Width, this.Location.Y);
            }
            if (this.Location.Y > System.Windows.Forms.SystemInformation.WorkingArea.Height - this.Size.Height)
            {
                this.Location = new Point(this.Location.X, System.Windows.Forms.SystemInformation.WorkingArea.Height - this.Size.Height);
            }
        }

------解决方案--------------------
NotifyIcon控件解决

------解决方案--------------------
网上很多  窗体抖动的代码！