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EventLog Constructor (String, String)

Initializes a new instance of the EventLog class. Associates the instance with a log on the specified computer.

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

Public Sub New ( _
	logName As String, _
	machineName As String _
Dim logName As String 
Dim machineName As String 

Dim instance As New EventLog(logName, _


Type: System.String

The name of the log on the specified computer.

Type: System.String

The computer on which the log exists.


The log name is Nothing.


The log name is invalid.


The computer name is invalid.

This overload sets the Log property to the logName parameter and the MachineName property to the machineName parameter. Before calling WriteEntry, specify the Source property of the EventLog. If you are only reading Entries from the log, you can alternatively specify only the Log and MachineName properties.


This overload of the constructor specifies the Log and MachineName properties, but you can change either before reading the Entries property.

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


Initial Value


An empty string ("").


The logName parameter.


The machineName parameter.

The following example reads entries in the event log, "myNewLog", on the computer "myServer".

Option Explicit
Option Strict

Imports System
Imports System.Diagnostics
Imports System.Threading
Imports Microsoft.VisualBasic

Class MySample
    Public Shared Sub Main()
        If Not EventLog.SourceExists("MySource") Then 
            ' Create the source, if it does not already exist. 
            ' An event log source should not be created and immediately used. 
            ' There is a latency time to enable the source, it should be created 
            ' prior to executing the application that uses the source. 
            ' Execute this sample a second time to use the new source.
            EventLog.CreateEventSource("MySource", "MyNewLog", "myServer")
            'The source is created.  Exit the application to allow it to be registered. 
        End If 

        ' Create an EventLog instance and assign its log name. 
        Dim myLog As New EventLog("myNewLog", "myServer")

        ' Read the event log entries. 
        Dim entry As EventLogEntry
        For Each entry In  myLog.Entries
            Console.WriteLine((ControlChars.Tab & "Entry: " & entry.Message))
        Next entry
    End Sub ' Main
End Class ' MySample

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