The asp.net text contains information about editing the registry. Before you edit the registry, be sure to understand how to restore the registry if a problem occurs. For information about how to restore the registry, see the "Restore Registry" Help topic in Regedit.exe or the "Restore registry key" Help topic in Regedt32.exe.
Phenomenon
When you use ASP.net to write a new "event source" to the event log, you may receive the following error message: System.Security.SecurityException: The requested registry access is not allowed
Reason
The default despair for running the asp.net process is the ASPNET (NetworkService below IIS6.0), and this user does not have permission to create an "event source."
Solutions
Note: (Editing the registry can cause a system crash, and so on, Microsoft won't say much). If you need to resolve this issue, before you run this asp.net program, you must create an "event source" by a user with administrator privileges. Here are a few ways to create an "event source."
First method
Use the following procedure to create an "event source" under Application log in Registry editing
1. Click "Start" and then click "Run".
2. Enter "regedit" in the Open box.
3. Locate the following subkeys:
Hkey_local_machine\system\currentcontrolset\services\eventlog\application
4. Right-click "Application" and click "New" and Point "item"
5. Rename this new item to "Test"
6. Close Registry Editor
A second method
There is a EventLogInstaller class in the System.Diagnostics namespace. It can create and configure event logs to be read and written by your application when it is shipped. With the following steps, we can use the EventLogInstaller class to create an event industry source
1. Use vb.net or C # to create a class library called EventLogSourceInstaller.
2. Add a reference to the System.Configuration.Install.dll in your project.
3. The automatically generated Class.vb\class.cs is more named Myeventloginstaller.vb\myeventloginstaller.cs.
4. The content in Myeventloginstaller.vb or MyEventLogInstaller.cs is replaced with the following code:
Visual Basic. NET Sample
Imports System.Diagnostics
Imports System.Configuration.Install
Imports System.ComponentModel
<runinstaller (True) > _
Public Class myEventLogInstaller
Inherits Installer
Private myEventLogInstaller as EventLogInstaller
Public Sub New ()
' Create An instance of ' EventLogInstaller '.
myEventLogInstaller = New EventLogInstaller ()
' Set ' the ' Source ' of the event log, to be created.
Myeventloginstaller.source = "TEST"
' Set the ' Log ' that ' the source is created in.
MyEventLogInstaller.Log = "Application"
' Add myeventloginstaller to ' installercollection '.
Installers.add (myEventLogInstaller)
End Sub
End Class
Visual C #. NET Sample
Using System;
Using System.Diagnostics;
Using System.ComponentModel;
Using System.Configuration.Install;
Namespace EventLogSourceInstaller
{
[Runinstaller (True)]
public class Myeventloginstaller:installer
{
Private EventLogInstaller myEventLogInstaller;
Public myEventLogInstaller ()
{
Create Instance of EventLogInstaller
myEventLogInstaller = new EventLogInstaller ();
Set the Source of Event Log, to be created.
Myeventloginstaller.source = "TEST";
Set the Log that this source is created in
MyEventLogInstaller.Log = "Application";
Add myEventLogInstaller to the installers Collection.
Installers.add (myEventLogInstaller);
}
}
}
5. Build this project and get EventLogSourceInstaller.dll.
6. Open the visual Studio. NET command Prompt and go to the EventLogSourceInstaller.dll directory.
7. Run this command to create an "event source": InstallUtil EventLogSourceInstaller.dll
More detailed information
We reproduce the above error and resolve the problem by creating a Web application.
1. Use vb.net or C # to build a asp.net Web application.
2. The code in WebForm1.aspx is replaced by the following code:
Visual Basic. NET Sample
<%@ Page language= "vb" autoeventwireup= "true"%>
<%@ Import namespace= "System.Diagnostics"%>
! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 transitional//en"
<HTML>
<script language= "VB" runat= "Server"
Sub WriteEvent_Click (SRC as Object, e as EventArgs)
Dim ev as New EventLog ("Application")
' Event ' s Source name
Ev. Source = "TEST"
EventLog.CreateEventSource (EV. Source, "Application")
Try
Ev. WriteEntry (TextBox1.Text)
Catch B As exception
Response.Write ("WriteEntry" & B.message & "<br>")
End Try
EV = Nothing
End Sub
</script>
<body>
<form id= "Form1" runat= "Server"
Event message:
<asp:textbox id= "TextBox1" runat= "Server" width= "233px" > </asp:textbox>
<asp:button id= "Button1" runat= "Server" Name= "Button1" text= "Write to Event log" > </asp:button>
</form>
</body>
</HTML>
Visual C #. NET Sample
<%@ Page language= "C #" autoeventwireup= "true"%>
<%@ Import namespace= "System.Diagnostics"%>
! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 transitional//en"
<HTML>
<script language= "C #" runat= "Server"
void WriteEvent_Click (Object Src, EventArgs e)
{
EventLog ev = new EventLog ("Application");
Event ' s Source name
Ev. Source = "TEST";
EventLog.CreateEventSource (EV. Source, "Application");
Try
{
Ev. WriteEntry (TextBox1.Text);
}
catch (Exception B)
{
Response.Write ("WriteEntry" + b.message + "<br>");
}
EV = NULL;
}
</script>
<body>
<form id= "Form1" runat= "Server"
Event message:
<asp:textbox id= "TextBox1" runat= "Server" width= "233px" > </asp:textbox>
<asp:button id= "Button1" runat= "Server" Name= "Button1" text= "Write to Event log" > </asp:button>
</form>
</body>
</HTML>
3. Press F5 to start this project.
4. Enter some characters in the textbox and click Write to Event Log.
5. The error message that is mentioned in the "Symptoms" section above appears.
6. To resolve this issue, in WebForm1.aspx the following line of code is commented
EventLog.CreateEventSource (EV. Source, "Application");
7. Restart the project.
