vb.net下窗体卸载事件

     vb.net下的窗体卸载事件不在使用Unload了，改用Closed，具体的写法如下：

   Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        Dim isDataSavad As MsgBoxResult
       isDataSavad = MsgBox("您确定要退出该系统吗？", vbYesNo + vbQuestion, "提示")

     If isDataSavad = vbNo Then
            e.Cancel = True
        Else
            e.Cancel = False
        End If
     End Sub

   看似很简单，除了方法名变了其它的几乎没有变化...