设置窗体属性showinTask=false;加notifyicon控件notifyIcon1，为控件notifyIcon1的属性Icon添加一个icon图标;添加窗体最小化事件

// this.SizeChanged += new System.EventHandler(this.Form1_SizeChanged);  //上面一行是主窗体InitializeComponent()方法中需要添加的引用  private void Form1_SizeChanged(object sender, EventArgs e)  {  if (this.WindowState==FormWindowState.Minimized)  {  this.Hide();  this.notifyIcon1.Visible=true;  }  }  .添加点击图标事件(首先需要添加事件引用)：  private void notifyIcon1_Click(object sender, EventArgs e)  {  this.Visible = true;  this.WindowState = FormWindowState.Normal;  this.notifyIcon1.Visible = false;  }   

.可以给notifyIcon添加右键菜单： 
主窗体中拖入一个ContextMenu控件contextMenu1，点中控件，在上下文菜单中添加菜单，notifyIcon1的ContextMenu行为中选中contextMenu1作为上下文菜单。 
(可以在子菜单中添加行为)