RemoveMenu hSysMenu, nCnt - 2, MF_BYPOSITION Or MF_REMOVE '''' Remove the seperator

                DrawMenuBar(Me.hwnd)

                '''' Force caption bar''''s refresh. Disabling X button

                Me.Caption = "Try to close me!"

            End If

        End If

End Sub

''''如果还要屏蔽Alt+F4，加上

    Private Sub Form_QueryUnload(ByVal Cancel As Integer, ByVal UnloadMode As Integer)

        Cancel = 1

    End Sub

在VB.NET中，这次需要借助API了，因为系统没有提供这样的类，这个例子，同时给大家提供了一个API的使用范例。（因为系统类库包装了绝大部分API，所以不推荐使用）

以下是VB.NET的代码：

    ''''API声明

    Private Declare Function GetSystemMenu Lib "User32" (ByVal hwnd As Integer, ByVal bRevert As Long) As Integer

    Private Declare Function RemoveMenu Lib "User32" (ByVal hMenu As Integer, ByVal nPosition As Integer, ByVal wFlags As Integer) As Integer

    Private Declare Function DrawMenuBar Lib "User32" (ByVal hwnd As Integer) As Integer

    Private Declare Function GetMenuItemCount Lib "User32" (ByVal hMenu As Integer) As Integer

    Private Const MF_BYPOSITION = &H400&

    Private Const MF_DISABLED = &H2&

    Private Sub disableX(ByVal wnd As Form)

        Dim hMenu As Integer, nCount As Integer

        ''''得到系统Menu

        hMenu = GetSystemMenu(wnd.Handle.ToInt32, 0)

        ''''得到系统Menu的个数

        nCount = GetMenuItemCount(hMenu)

        ''''去除系统Menu

        Call RemoveMenu(hMenu, nCount - 1, MF_BYPOSITION Or MF_DISABLED)

        ''''重画MenuBar

        DrawMenuBar(Me.Handle.ToInt32)

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        ''''使用X不能用

        disableX(Me)

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        ''''关闭窗口

        Me.Close()

End Sub

    ''''如果还要屏蔽Alt+F4，加上

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)

        Dim SC_CLOSE As Integer = 61536

        Dim WM_SYSCOMMAND As Integer = 274

        ''''判断是系统消息，是不是关闭窗体,使Alt+F4无效

        If m.Msg = WM_SYSCOMMAND AndAlso m.WParam.ToInt32 = SC_CLOSE Then

            Exit Sub

        End If

        MyBase.WndProc(m)

    End Sub

程序运行的结果如下：

5、              无标题栏的窗体的拖动问题

在特殊窗体的应用中，我们有时需要把窗体的标题栏屏蔽掉，以窗体换上自己的外壳。是，当去掉了窗体标题栏后，移动窗体就成了一个问题。

我们还是来看一下在VB6中的实现，VB6中实现（借助API函数SendMessage）

在设计时将窗体的BorderStyle属性设置为0-none

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