vb.net拖动无窗体界面

Private oOriginalRegion As Region = nothing
　　' 用于窗体移动
　　Private bFormDragging As Boolean = False
　　Private oPointClicked As Point 
　　'******************************************

　　Private Sub Form1_MouseDown(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

　　Me.bFormDragging = True
　　Me.oPointClicked = New Point(e.X,e.Y)

　　End Sub
　　'******************************************

　　Private Sub Form1_MouseUp(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
　　Me.bFormDragging = False

　　End Sub
　　'******************************************


Private Sub Form1_MouseMove(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
　　If Me.bFormDragging Then
　　Dim oMovetoPoint As Point
　　' 以当前鼠标位置为基础，找出目标位置
　　oMovetoPoint = Me.PointToScreen(New Point(e.X,e.Y))
　　' 根据开始位置作出调整
　　oMovetoPoint.Offset(Me.oPointClicked.X * -1,_
　　(Me.oPointClicked.Y + _
　　Systeminformation.CaptionHeight + _
　　Systeminformation.BorderSize.Height) * -1)
　　' 移动窗体
　　Me.Location = oMovetoPoint
　　End If

　　End Sub