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Using Logging application Block in Enterprise library 4.0 - Step By Step

By ShivPrasad Koirala
Posted On Oct 03,2008
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No of Comments: 5
Category: ASP.Net
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Using Logging application Block in Enterprise library 4.0



It’s new world of software reusability. Gone are the days when we need to build things from scratch. One of the most needed functionality is the logging utility. Every software project needs a logging utility. To make your own logging utility is a big project by itself.  In this tutorial we will quickly run through how you can use Microsoft logging application blocks to log messages and activities.

You can log your errors or debug messages to the following sources using logging application blocks:-


Ø       Event log

Ø       Email

Ø       Database

Ø       Message queue

Ø       Write to text file

Ø       WMI events

Ø       Custom locations using application block extension points


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Step 1

Create a new project with a simple button on the ASPX page. Let’s name this button as btnlogger. What we will do it when any one clicks on this button we will log a error message in the event log.


Figure :- Simple project


Step 2


Download the Enterprise library 4.0 from . Once you install it you should see the same in programs – Microsoft patterns and practices.Click on open and browse to your web.config file and click the open button.




Figure :- Enterprise library installed

Figure :- Open the web.config file


Step 3

All your logging facility is stored on the web.config file. Now right click on the tree , click new and click logging application block menu.

Figure: - Add logging application block


Step 4

By default the logging utility logs to event logs. So you will see in the trace listeners a event log trace listeners already added. Click on the event log trace listeners and specify the machine name. Currently my machine name is HP.

Figure:- Specify machine name


Step 5

Now that we have defined the necessary configuration using the logging enterprise tool. It’s time to call the same in the code. So we add the Enterprise logging application DLL , add the logging namespace , create object of ‘logentry’ object and finally log the message using the logger DLL.


Figure: - Use the logging application block


Now if you run the program and click the button you should see the message logged in event viewer. To view event viewer click on start , run and type eventvwr.


Figure: - Logged in the event viewer




Error logging is an important module in most of the enterprise applications we develop. Understanding this importance Microsoft released a logging application that is very well proved and optimized for performance. This article gave us a simple walkthrough to use in our application.


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Hi ShivPrasad,

Thanks, The article is pretty usefull..
Image sizes
article is very good. easy to understand .thanks for the post.
Images are not displyaing properly. you might provide link to full image.
no detailed description
Screen Shots
Dude, your screen shots are unreadable. Please use the snipping tool or snippy.exe and cut only the relevant portions of the screen
Nice Walkthrough!