In this tutorial, I will teach you how to Write an Entry to the Application Event Logs by using Visual Basic 2008. Logs are very important because it will track every event that are happening in your application.

So, let’s begin:

1. Open Visual Basic 2008.
2. Create a new Windows Application.
3. Make the Form just like this.



Now, go to the code view. Create a variable that will set the entry type of the event log. And then, set it to default type which is “information”.

1. Private
   
   entry_type As
   
   System.
   
   Diagnostics
   
   .
   
   EventLogEntryType
   
   =
   
   EventLogEntryType.
   
   Information
   

After that, you have to create a method for the entry type that you're going to use. Combine the three Radio Button that handles the click

events.

1. Private
   
   Sub
   
   rdo_Click(
   
   ByVal
   
   sender As
   
   System.
   
   Object
   
   , ByVal
   
   e As
   
   System.
   
   EventArgs
   
   )
   
   _
   
2. Handles
   
   rdoWarning.
   
   Click
   
   , rdoInfo.
   
   Click
   
   , rdoError.
   
   Click
   
3. 
   
4. 'THIS PROCEDURE HANDLES THE CLICK EVENT OF ALL THE RADIO BUTTONS.
   
5. 'YOU WILL KNOW WHICH RADIO BUTTON WAS CLICKED BECAUSE
   
6. ' IT WILL PASS IN AS THE "SENDER" ARGUMENT.
   
7. Dim
   
   rdo As
   
   RadioButton =
   
   CType
   
   (
   
   sender, RadioButton)
   
8. 'SET THE PROPERTY NAME OF THE RADIO BUTTONS
   
9. Select
   
   Case
   
   rdo.
   
   Name
   
10. Case
    
    "rdoWarning"
    
    'NAME OF THE RADIO BUTTON
    
11. entry_type =
    
    EventLogEntryType.
    
    Warning
    
12. Case
    
    "rdoInfo"
    
    'NAME OF THE RADIO BUTTON
    
13. entry_type =
    
    EventLogEntryType.
    
    Information
    
14. Case
    
    "rdoError"
    
    'NAME OF THE RADIO BUTTON
    
15. entry_type =
    
    EventLogEntryType.
    
    Error
    
16. End
    
    Select
    
17. 
    
18. End
    
    Sub
    

Lastly, do this following code for writing an entry for your event logs.

1. Private
   
   Sub
   
   Button1_Click(
   
   ByVal
   
   sender As
   
   System.
   
   Object
   
   , ByVal
   
   e As
   
   System.
   
   EventArgs
   
   )
   
   Handles
   
   Button1.
   
   Click
   
2. Try
   
3. If
   
   IsNumeric
   
   (
   
   txtId.
   
   Text
   
   )
   
   Then
   
4. 'WRITE THE NAME OF THE LOG ON THE FIRST PARAMETERS.
   
5. 'FOR THE SECOND PARAMETER, IS THE NAME OF THE LOCAL MACHINE.
   
6. 'AND FOR THE THIRD PARAMETER, IS THE SOURCE OF THE EVENT.
   
7. 'THIS IS SET COMMONLY EQUAL TO THE NAME OF THE APPLICATION.
   
8. Dim
   
   eventLog As
   
   New
   
   EventLog(
   
   "Application"
   
   , My.
   
   Computer
   
   .
   
   Name
   
   , "Write Event Logs"
   
   )
   
9. 
   
10. 'SET THE FIRST PARAMETER FOR THE MESSAGE THAT YOU PUT IN THE TEXT BOX.
    
11. 'FOR THE SECOND PARAMETER, IS THE ENTRY TYPE YOU WANT TO SET WHETHER
    
12. ' IT IS A WARNING , AN IMFORMATION OR AN ERROR.
    
13. 'AND THE THIRD PARAMETER, IS FOR THE ID OF THE EVENT.
    
14. ' YOU CAN USE THIS TO LOOK FOR FURTHER INFORMATION IN THE HELP FILE
    
15. eventLog.
    
    WriteEntry
    
    (
    
    txtname.
    
    Text
    
    , entry_type, CInt
    
    (
    
    txtId.
    
    Text
    
    )
    
    )
    
16. 
    
17. eventLog.
    
    Close
    
    (
    
    )
    
18. 
    
19. MsgBox
    
    (
    
    "Entry written to the event log."
    
    , MsgBoxStyle.
    
    OkOnly
    
    , Me
    
    .
    
    Text
    
    )
    
20. Else
    
21. 'THIS WILL PERFORM IF THE EVENT ID WAS NOT NUMERIC.
    
22. MsgBox
    
    (
    
    "Put the numeric value into EventID text box."
    
    , MsgBoxStyle.
    
    OkOnly
    
    , _
    
23. Me
    
    .
    
    Text
    
    &
    
    " Error"
    
    )
    
24. End
    
    If
    
25. Catch
    
    secEx As
    
    System.
    
    Security
    
    .
    
    SecurityException
    
26. MsgBox
    
    (
    
    "Security error writing to the event log."
    
    , _
    
27. MsgBoxStyle.
    
    OkOnly
    
    , Me
    
    .
    
    Text
    
    &
    
    " Error"
    
    )
    
28. Catch
    
    ex As
    
    Exception
    
29. MsgBox
    
    (
    
    "Error accessing logs on the local machine."
    
    , MsgBoxStyle.
    
    OkOnly
    
    , Me
    
    .
    
    Text
    
    &
    
    " Error"
    
    )
    
30. End
    
    Try
    
31. End
    
    Sub