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EventLog.LogNameFromSourceName Method

Gets the name of the log to which the specified source is registered.

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

Public Shared Function LogNameFromSourceName ( _
	source As String, _
	machineName As String _
) As String
Dim source As String 
Dim machineName As String 
Dim returnValue As String 

returnValue = EventLog.LogNameFromSourceName(source, _


Type: System.String

The name of the event source.

Type: System.String

The name of the computer on which to look, or "." for the local computer.

Return Value

Type: System.String
The name of the log associated with the specified source in the registry.

The event source indicates what logs the event. It is often the name of the application, or the name of a subcomponent of the application, if the application is large. Applications and services should write to the Application log or a custom log. Device drivers should write to the System log.

When you create a new source, which can only write to one log at a time, the system registers your application with the event log as a valid source of entries. The Source property can be any string, but the name cannot be used by other sources on the computer. An attempt to create a duplicated Source value throws an exception. However, a single event log can have many different sources writing to it.

The following example deletes a source from the local computer. The example determines the log from its source, and then deletes the log.


More than one source might write to an event log. Before deleting a custom log, make sure there are no other sources writing to that log.

Option Explicit On
Option Strict On

Imports System
Imports System.Diagnostics
Imports System.Threading

Class MySample
    Public Shared Sub Main()
        Dim logName As String 

        If EventLog.SourceExists("MySource") Then 
            ' Find the log associated with this source.    
            logName = EventLog.LogNameFromSourceName("MySource", ".")
            ' Make sure the source is in the log we believe it to be in 
            If (logName <> "MyLog") Then 
            End If 
            ' Delete the source and the log.

            Console.WriteLine((logName & " deleted."))
            ' Create the event source to make next try successful.
            EventLog.CreateEventSource("MySource", "MyLog")
        End If 
    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