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EventLog.Clear Method

Removes all entries from the event log.

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

Public Sub Clear


The event log was not cleared successfully.


The log cannot be opened. A Windows error code is not available.


A value is not specified for the Log property. Make sure the log name is not an empty string.


The log does not exist.

Event logs are set with a maximum size that determines how many entries they can contain. When an event log is full, it stops recording new event information or begins to overwrite earlier entries. If event recording stops, you can use this method to clear the log of existing entries and allow it to start recording events again. You must have administrator permissions to the computer on which the log resides to clear event log entries.

Clear closes the event log, releases the event handles, retrieves new read and write handles, and reopens the event log. Events received after the call to the method are not cleared along with the existing events.

The following example clears an event log.

Caution noteCaution

Because Application, System, Security, and other non-custom logs can contain crucial information; be sure to specify a custom log before executing this example code. This example deletes the custom log myNewLog.

Option Explicit
Option Strict

Imports System
Imports System.Diagnostics
Imports System.Threading

Class MySample
    Public Shared Sub Main()
        ' Create an EventLog instance and assign its log name.
        Dim myLog As New EventLog()
        myLog.Log = "myNewLog"

    End Sub 'Main
End Class 'MySample

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Community Additions

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