窗体应用技巧二，创建透明的窗体。 创建新工程后，选择Form1窗体，添加Label1、TrackBar1、Timer1控件。为了突出效果为窗体选择一个好看的背景。
相关的属性设置如下：
TrackBar1 Value属性:
TickFrequency: 属性:
Maximum属性: 100
10
100
Label1 Text属性: 选择窗体的透明度:
Timer1 Interval属性: 100
进入代码编辑器，输入代码：
首先进行声明：
Public Class Form1
Inherits System.Windows.Forms.Form
Dim tps As Integer
Dim bol As Boolean
进入TrackBar1_Scroll事件
Private Sub TrackBar1_Scroll(ByVal sender As Object,
ByVal e As System.EventArgs) Handles TrackBar1.Scroll
Me.Opacity = TrackBar1.Value / 100
Label1.Text = "窗体透明度：" & CStr(Me.Opacity * 100) & "%"
End Sub
进入Timer1_Tick事件
Private Sub Timer1_Tick(ByVal sender As Object,
ByVal e As System.EventArgs) Handles Timer1.Tick
If bol = False Then
tps = tps + 1
Me.Opacity = tps / 100
If Me.Opacity >= 1 Then
Timer1.Enabled = False
bol = True
End If
Else
tps = tps - 1
Me.Opacity = tps / 100
If Me.Opacity <= 0 Then
Timer1.Enabled = False
bol = False
End If
End If
End Sub
进入Form1_Load事件
Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
End Sub
进入Form1_Closing事件
Private Sub Form1_Closing(ByVal sender As Object,
ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
Timer1.Enabled = True
If MsgBox("你确实要关闭窗体吗？", MsgBoxStyle.OkCancel) = MsgBoxResult.Ok Then
e.Cancel = False
Else
Timer1.Enabled = False
Me.Opacity = 1
tps = 100
bol = True
e.Cancel = True
End If
End Sub
创建完成后我们来运行程序测试一下，测试成功，程序窗体是不是变得透明了，通过调节滚动条我们甚至可以使得窗体消失达到完全隐形的目的。这是不是很神奇呢？
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