如何拖动没有边框的窗体？

这个功能在VB6中，需要借助于API函数才能实现。而在VB.net中，凭自己的功能就能实现。首先设置窗体的FormBorderStyle属性为none以去掉窗体的边框，然后在窗体上添加一个按钮。窗体中的代码如下：

 Public Class Form1
 　Inherits System.<a href="http://dev.21tx.com/os/windows/" target="_blank">Windows</a>.Forms.Form

 　Private mouse_offset As Point
 　Private Sub form1_MouseDown(ByVal sender As Object, _
   ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown
 　　mouse_offset = New Point(e.X, e.Y)
 　End Sub

 Private Sub form1_MouseMove(ByVal Sender As System.Object, _
  ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
 　'按住鼠标左右键均可拖动窗体
 　If e.Button = MouseButtons.Left Or e.Button = MouseButtons.Right Then
 　　Dim mousePos As Point = Sender.findform().MousePosition
 　　'获得鼠标偏移量
 　　mousePos.Offset(-mouse_offset.X, -mouse_offset.Y)
 　　'设置窗体随鼠标一起移动
 　　Sender.findform().Location = mousePos
 　End If
 End Sub

 Private Sub BtnExit_Click(ByVal sender As System.Object, _
  ByVal e As System.EventArgs) Handles Button1.Click
 　'关闭窗体
 　Me.Close()
 End Sub
 End Class