MessageBeep (user32)
Last changed: -92.251.8.36

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Summary
Plays a waveform sound.

C# Signature:

[DllImport("user32.dll")]
static extern bool MessageBeep(uint uType);

VB Signature:

Declare Function MessageBeep Lib "user32.dll" (uType As Integer) As Boolean

Notes:

You can delete all lines beginning with \\\ or keep it if you are generating documentation from code comments

Tips & Tricks:

Just add the sample code and a using system.runtime.interopservices;

With the enum beepType you get intellisense when you type "beep." and you can then select the kind of beep you want

Sample Code:

    /// <summary>
    /// Enum type that enables intellisense on the private <see cref="Beep"/> method.
    /// </summary>
    /// <remarks>
    /// Used by the public Beep <see cref="Beep"/></remarks>
    public enum beepType
    {
        /// <summary>
        /// A simple windows beep
        /// </summary>            
        SimpleBeep  = -1,
        /// <summary>
        /// A standard windows OK beep
        /// </summary>
        OK    = 0x00,
        /// <summary>
        /// A standard windows Question beep
        /// </summary>
        Question  = 0x20,
        /// <summary>
        /// A standard windows Exclamation beep
        /// </summary>
        Exclamation  = 0x30,
        /// <summary>
        /// A standard windows Asterisk beep
        /// </summary>
        Asterisk  = 0x40,
    }

    [DllImport("User32.dll", ExactSpelling=true)]
    private static extern bool MessageBeep(uint type);

    /// <summary>
    /// Method to call interop for system beep
    /// </summary>
    /// <remarks>Calls Windows to make computer beep</remarks>
    /// <param name="type">The kind of beep you would like to hear</param>
    public static void beep(beepType type)
    {
        MessageBeep((uint)type);
    }

Alternative Managed API:

System.Console.Beep, coming in v2.0 (Whidbey) of the .NET Framework

Documentation
MessageBeep on MSDN