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    Private Shared Function GetSystemMenu(ByVal hWnd As IntPtr, ByVal bRevert As Boolean) As IntPtr

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        Dim hMenu = GetSystemMenu(Me.Handle, False)

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    static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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        hMenu = GetSystemMenu(frm.Handle,false);

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    Private Shared Function GetSystemMenu(ByVal hWnd As IntPtr, ByVal bRevert As Boolean) As IntPtr

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    EnableMenuItem(GetSystemMenu(Me.Handle, False), SC_CLOSE, MF_GRAYED)

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    static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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        hMenu = GetSystemMenu(frm.Handle,false);

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Summary

The GetSystemMenu API

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static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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Private Shared Function GetSystemMenu(ByVal hWnd As IntPtr, ByVal bRevert As Boolean) As IntPtr

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    static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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        hMenu = GetSystemMenu(frm.Handle,false);

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    static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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        IntPtr hMenu = GetSystemMenu(handle, false);

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Documentation

[GetSystemMenu] on MSDN

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       IntPtr hmenusys = GetSystemMenu(hWin, false);

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    static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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        hMenu = GetSystemMenu(frm.Handle,false);

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        private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

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            IntPtr sysMenuHandle = GetSystemMenu(this.Handle, false);