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static extern bool MessageBeep(beepType uType);

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Private Shared Function MessageBeep(ByVal uType As beepType) As Boolean

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method public static pinvokeimpl boolean MessageBeep(var uType as integer)

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    private static extern bool MessageBeep(uint type);

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        MessageBeep((uint)type);

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        private static extern bool MessageBeep(uint type);

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            MessageBeep((uint)type);

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Article http://msdn.microsoft.com/msdnmag/issues/03/07/NET/ ("Calling Win32 DLLs in C# with P/Invoke") gives a helpful wrapper class for MessageBeep.

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Documentation

[MessageBeep] on MSDN