bc30456错误…xxxx不是yyyy的成员

Question

嗨，我刚刚开始学习VB，就像在VS 2015中一样。我正在从Bryon Newsome撰写的《 Beginning Visual Basic 2015》一书中进行练习。 我无法从发布者论坛或发布者本身获得任何帮助。 我在较早的练习中设法解决了此类错误，但是以下内容无法解决。

以下是第214页至第215页的代码：

Public Class Form1
    Private Sub btn2Buttons_Click(sender As Object,
    e As EventArgs) Handles btn2Buttons.Click
        If MessageBox.Show("Your Internet connection will now be closed.",
           "Network Notification", MessageBoxButtons.OKCancel,
           MessageBoxIcon.Information, MessageBoxDefaultButton.Button1) _
   = Windows.Forms.DialogResult.OK Then

            lblResults.Text = "OK Clicked"
            'Call some method here
        Else
            lblResults.Text = "Cancel Clicked"
            'Call some method here
        End If
    End Sub


End Class

以下是来自两个错误消息：

Severity    Code    Description Project File    Line
Error   BC30456 'OKCancel' is not a member of 'MessageBoxButtons'.  MessageBoxButtons   E:\Document\Programing\VB\MessageBoxButtons\MessageBoxButtons\Form1.vb  5

Severity    Code    Description Project File    Line
Error   BC30456 'Forms' is not a member of 'Windows'.   MessageBoxButtons   E:\Document\Programing\VB\MessageBoxButtons\MessageBoxButtons\Form1.vb  7

标签只有一个：lblResults带有文本属性

有一个按钮：具有文本属性2 Buttons的btn2buttons。

Answer 1

If MessageBox.Show("Your Internet connection will now be closed.",
       "Network Notification", System.Windows.Forms.MessageBoxButtons.OKCancel,
       System.Windows.Forms.MessageBoxIcon.Information, System.Windows.Forms.MessageBoxDefaultButton.Button1) = Windows.Forms.DialogResult.OK Then

            lblResults.Text = "OK Clicked"
            'Call some method here
        Else
            lblResults.Text = "Cancel Clicked"
            'Call some method here
        End If