' Initalize the NofifyIcon object's shortcut menu.
Private Sub InitializeContextMenu()
    Dim menuList() As MenuItem = New MenuItem() _
                {New MenuItem("Sign In"), New MenuItem("Get Help"), _
                New MenuItem("Open")}
    Dim clickMenu As New ContextMenu(menuList)
    NotifyIcon1.ContextMenu = clickMenu
End Sub


' When user clicks the left mouse button display the shortcut menu.  
' Use the SystemInformation.PrimaryMonitorMaximizedWindowSize property
' to place the menu at the lower corner of the screen.
Private Sub NotifyIcon1_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles NotifyIcon1.Click

    Dim windowSize As System.Drawing.Size = _
        SystemInformation.PrimaryMonitorMaximizedWindowSize
    Dim menuPoint As System.Drawing.Point = New System.Drawing.Point _
        (windowSize.Width - 180, windowSize.Height - 5)
    menuPoint = Me.PointToClient(menuPoint)

    NotifyIcon1.ContextMenu.Show(Me, menuPoint)
End Sub

' 导入命名空间
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms

public class NotifyIconVisibleDoubleClick
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents NotifyIcon1 As System.Windows.Forms.NotifyIcon
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))
        Me.NotifyIcon1 = New System.Windows.Forms.NotifyIcon(Me.components)
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'NotifyIcon1
        '
        Me.NotifyIcon1.Icon = new System.Drawing.Icon("i.ico")
        Me.NotifyIcon1.Text = "NotifyIcon1"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(88, 88)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(112, 24)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Click Me"
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 24.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(0, 0)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(216, 48)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Notify Icons"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub NotifyIcon1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles NotifyIcon1.DoubleClick
        MsgBox("You double clicked the notify icon.")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        NotifyIcon1.Visible = True
    End Sub
End Class