C# Signature:

[DllImport("kernel32.dll")]
static extern bool Beep(uint dwFreq, uint dwDuration);

VB Signature:

Declare Function Beep Lib "kernel32.dll" (dwFreq As Integer, _
   dwDuration As Integer) As Boolean

Parameter Information:

dwFreq

Windows NT:

Specifies the frequency, in hertz, of the sound. This parameter must be in the range 37 through 32,767 (0x25 through 0x7FFF).

Windows 95:

The parameter is ignored.

dwDuration

Windows NT:

Specifies the duration, in milliseconds, of the sound.

Windows 95:

The parameter is ignored.

Notes:

Unlike MessageBeep, this function is synchronous. (It doesn't return control to its caller until the sound finishes.)

Tips & Tricks:

Please add some sample code!

Sample Code:

The following sample plays the PC speaker in a series of ascending frequencies:

using System;
using System.Runtime.InteropServices;

class BeepSample
{
    [DllImport("kernel32.dll")]
    static extern bool Beep(uint dwFreq, uint dwDuration);

    static void Main()
    {
        Console.WriteLine("Testing PC speaker...");
        for (uint i = 100; i <= 20000; i++)
        {
            Beep(i, 5);
        }
        Console.WriteLine("Testing complete.");
    }
}

Added by David C. Carachi

Alternative Managed API:

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

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