Public Shared Sub CreateEventSourceSample1(ByVal messageFile As String)

    Dim myLogName As String
    Dim sourceName As String = "SampleApplicationSource"

    ' Create the event source if it does not exist.
    If Not EventLog.SourceExists(sourceName)
    
        ' Create a new event source for the custom event log
        ' named "myNewLog."  

        myLogName = "myNewLog"
        Dim mySourceData As EventSourceCreationData = New EventSourceCreationData(sourceName, myLogName)

        ' Set the message resource file that the event source references.
        ' All event resource identifiers correspond to text in this file.
        If Not System.IO.File.Exists(messageFile)

            Console.WriteLine("Input message resource file does not exist - {0}", _
                messageFile)
            messageFile = ""
        Else 
            ' Set the specified file as the resource
            ' file for message text, category text and 
            ' message parameters strings.

            mySourceData.MessageResourceFile = messageFile
            mySourceData.CategoryResourceFile = messageFile
            mySourceData.CategoryCount = CategoryCount
            mySourceData.ParameterResourceFile = messageFile

            Console.WriteLine("Event source message resource file set to {0}", _
                messageFile)
        End If

        Console.WriteLine("Registering new source for event log.")
        EventLog.CreateEventSource(mySourceData)
    Else
        ' Get the event log corresponding to the existing source.
        myLogName = EventLog.LogNameFromSourceName(sourceName,".")
    End If

    ' Register the localized name of the event log.
    ' For example, the actual name of the event log is "myNewLog," but
    ' the event log name displayed in the Event Viewer might be
    ' "Sample Application Log" or some other application-specific
    ' text.
    Dim myEventLog As EventLog = New EventLog(myLogName, ".", sourceName)
    
    If messageFile.Length > 0
        myEventLog.RegisterDisplayName(messageFile, DisplayNameMsgId)
    End If
End Sub

Option Explicit
Option Strict

Imports System.Diagnostics
Imports System.Threading

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")
            Console.WriteLine("CreatingEventSource")
            'The source is created.  Exit the application to allow it to be registered.
            Return
        End If
        
        ' Create an EventLog instance and assign its source.
        Dim myLog As New EventLog()
        myLog.Source = "MySource"
        
        ' Write an informational entry to the event log.    
        myLog.WriteEntry("Writing to event log.")
    End Sub
End Class

' 导入命名空间
Imports System.Diagnostics
Imports System.Threading

Class MySample
    Public Shared Sub Main()
        ' Create the source, if it does not already exist.
        If Not EventLog.SourceExists("MySource", "MyServer") Then
            EventLog.CreateEventSource("MySource", "MyNewLog", "MyServer")
            Console.WriteLine("CreatingEventSource")
        End If
        
        ' Create an EventLog instance and assign its source.
        Dim myLog As New EventLog()
        myLog.Source = "MySource"
        
        ' Write an informational entry to the event log.    
        myLog.WriteEntry("Writing to event log.")
        
        Console.WriteLine("Message written to event log.")
    End Sub
End Class

' 导入命名空间
Imports System.Diagnostics
public class Test
   Shared Dim logStatus As System.Diagnostics.EventLog = New System.Diagnostics.EventLog

   public Shared Sub Main
        
        If Not EventLog.SourceExists("StatusSource") Then
            EventLog.CreateEventSource("StatusSource", "StatusLog")
            Console.WriteLine("Creating event source")
        End If

        ' Set the EventLog component's source.
        logStatus.Source = "StatusSource"

        ' Write a Starting message to the log.
        ShowLog()
        logStatus.Clear()
        ShowLog()
   End Sub
    Private Shared Sub ShowLog()
        For Each log_entry As EventLogEntry In logStatus.Entries
            Console.WriteLine(log_entry.Message)
        Next log_entry
    End Sub
   
End class