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Timer Constructor

Initializes a new instance of the Timer class, and sets all the properties to their initial values.

Namespace:  System.Timers
Assembly:  System (in System.dll)

Public Sub New
Dim instance As New Timer()

The following table shows initial property values for an instance of Timer.


Initial value






100 milliseconds


A null reference (Nothing in Visual Basic)

The following code example sets up an event handler for the Timer.Elapsed event, creates a timer, and starts the timer. The event handler displays the SignalTime property each time it is raised.

Imports System
Imports System.Timers

Public Class Timer1

    Private Shared aTimer As System.Timers.Timer

    Public Shared Sub Main()
        ' Normally, the timer is declared at the class level, 
        ' so that it stays in scope as long as it is needed. 
        ' If the timer is declared in a long-running method,   
        ' KeepAlive must be used to prevent the JIT compiler  
        ' from allowing aggressive garbage collection to occur  
        ' before the method ends. You can experiment with this 
        ' by commenting out the class-level declaration and  
        ' uncommenting the declaration below; then uncomment 
        ' the GC.KeepAlive(aTimer) at the end of the method. 
        'Dim aTimer As System.Timers.Timer 

        ' Create a timer with a ten second interval.
        aTimer = New System.Timers.Timer(10000)

        ' Hook up the Elapsed event for the timer. 
        AddHandler aTimer.Elapsed, AddressOf OnTimedEvent

        ' Set the Interval to 2 seconds (2000 milliseconds).
        aTimer.Interval = 2000
        aTimer.Enabled = True

        Console.WriteLine("Press the Enter key to exit the program.")

        ' If the timer is declared in a long-running method, use 
        ' KeepAlive to prevent garbage collection from occurring 
        ' before the method ends. 
    End Sub 

    ' Specify what you want to happen when the Elapsed event is  
    ' raised. 
    Private Shared Sub OnTimedEvent(source As Object, e As ElapsedEventArgs)
        Console.WriteLine("The Elapsed event was raised at {0}", e.SignalTime)
    End Sub 
End Class 

' This code example produces output similar to the following: 

'Press the Enter key to exit the program. 
'The Elapsed event was raised at 5/20/2007 8:42:27 PM 
'The Elapsed event was raised at 5/20/2007 8:42:29 PM 
'The Elapsed event was raised at 5/20/2007 8:42:31 PM 

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0