What’s new in .NET Framework 4.5

October 1st, 2012

Here is a nice poster to summarize what’s new in .NET Framework 4.5:


Concerning ASP.NET, I like:

  • New site template for ASPNET MVC 4
  • Built-in Javascript + CSS combining and minification
  • Strongly typed data binding in ASP.NET Web Forms
  • Multiple file upload component for ASP.NET Web Forms
  • IIS Express used by default (instead of Cassini)

Non classé

Difference between “Independent association” and “Foreign key association” in Entity Framework

September 11th, 2012

I begin to understand the difference between “Independent association” and “Foreign key association” in Entity Framework Code First thanks to this article : http://www.ladislavmrnka.com/2011/05/foreign-key-vs-independent-associations-in-ef-4/

Advice: use both (Independent associations and Foreign key associations):

“This saves on unnecessary DB lookups, allows lazy loaking, and allows you to easily see/set the ID if you know what you want it to be. Note that having both does not change your table structure in any way.”

Source: http://stackoverflow.com/questions/5281974/code-first-independent-associations-vs-foreign-key-associations

Entity Framework

Which version of ASP.NET MVC is used in an existing Visual Studio project

September 11th, 2012

Question: how to find which version of ASP.NET MVC is used in an existing Visual Studio project?

Answer: via Reflection:

typeof (Controller).Assembly.GetName().Version 

Source: http://stackoverflow.com/questions/3008704/how-to-determine-the-current-version-of-asp-net-mvc


Copier coller du texte sans conserver la mise en forme

September 10th, 2012

PureText est un petit utilitaire qui permet de faire un copier-coller d’un bout de texte sans conserver la mise en forme d’origine (gras, souligné, style, code html, etc.) et de coller uniquement le texte brut.

Source : http://www.stevemiller.net/puretext/


Publier automatiquement votre dernier article de blog sur Twitter

September 10th, 2012

Le plugin “WP to Twitter” permet de publier automatiquement vos articles de blogs WordPress sur votre compte Twitter.

La configuration du plugin demande quelques minutes d’attention (récupération des paramètres Consumer key, Consumer secret, Access token, Access token secret via https://dev.twitter.com/) mais ensuite cela marche très bien.

En savoir plus : http://cleverwp.com/publish-to-twitter-automatically-from-your-wordpress-blog/


Revue de presse Avast antivirus juin 2012

July 7th, 2012


Avast , , ,

Improve error feedback on ASP.NET applications using Health Monitoring

December 12th, 2011

When I switched from PHP to ASP.NET, I searched an equivalent to error_reporting() function.

I wanted to monitor all errors that happened on our production server. I know production software should be bug free but in the real world, bugs happen in many unexpected ways : an unusual navigation of the user that you hadn’t thought, an external database result which contains something that you didn’t even imagine in your units tests (database mocking is another topic…).

Context : we have a lot ASP.NET applications in production (more than 100), so modifying every application wasn’t an appropriate option.

Here is the steps of my implementation :

1. Natively, DotNet Framework adds in Windows Event Log an warning event when an exception occurs in an ASP.NET application (Yellow Screen of Death).
This mechanism is configurable through System Health Monitoring.
Windows event log is purged automatically but I currently have 3 or 4 weeks of history so it’s enough (“By default, event logs are set with a maximum file size of 512 KB. Then, when a log reaches this limit, events older than seven days are overwritten to prevent the log from exceeding the maximum file size”).

2. I created an executable (C# console project) which reads the event log and send an email to the appropriate developper(s) :

  • I use a CSV file with correspondence between “ASP.NET application URL” and the “email’s developer”. Simple but effective to avoid any dependency of an external resource that could fail (such as database, which will prevents me from being notified of -the so-called failure).
  • In fact, I still depend on the mail server… (I could provide a fail over solution that uses the command "NET SEND", SNMP… It would be good but a bit luxury at the stage).

3. A Windows Scheduled Task is configured (every 5 minutes) on the machine running IIS to run the executable.

  • A text file contains the date and time of the last exception that was sent by mail.
    Exceptions are sent by email and only once regardless of how often the scheduled task is executed. If the scheduled task didn’t run for any reason, just restart it and it will send emails back where it left off.

4. Display a Custom Error Page with the opportunity for the user to enter a comment and then sent it by email to the appropriate developer.
This mechanism is configurable through Web.config file. I created an .aspx page as simple as possible (no external dependencies) with a textbox and a "send" button.
This helps to stimulate the user feedback and hide the error details (for security reasons).

=> Conclusion : the main advantage of this hand made tool is that it requires no change in source code of the other applications.

  • 90% of users don’t call (or don’t know how to call) the IT department when they encounter an exception.
  • A small number of exceptions that occur aren’t visible to the user (mainly session handling errors).
  • The most common exceptions are easy to reproduce and fix (80-20 rule ?).
  • Then it becomes increasingly difficult to diagnose the type of exception and the call stack isn’t sufficient to understand what happened (I need to know the data entered by the user).
    I also developed a web application to group, sort and filter the exceptions but this will be the subject of another article.

Possible improvements :

  • Collect user input data and send it to the developer.
  • Find a way to catch and report client side Javascript exceptions to the server. Any idea ?

References :

ASP.NET , , ,

Publier ses photos sur Flickr à partir du logiciel Picasa

December 2nd, 2010

Question : Est ce que l’on peut publier ses photos sur le site Flickr à partir du logiciel Google Picasa v3 ?

Réponse : Oui, en utilisant le plugin picasa2flickr

Remarque : L’installation est plus facile si l’on télécharge le plugin picasa2flickr avec le navigateur Google Chrome (qui associe le fichier .pbz au logiciel Google Picasa).

Source : How To Upload Photos To Flickr From Picasa.


Fiabilité de l’installation de plusieurs versions d’Internet Explorer sur la même machine

December 1st, 2010

Question : Est ce que les solutions qui permettent d’installer plusieurs versions d’Internet Explorer sur la même machine sont fiables ?

Réponse : Non, les solutions du type IETester, IECollection ou Multiple IE ne sont pas stables (plantages relativement fréquents) et n’assure pas un comportement 100% identique à la version originale d’Internet Explorer.

Remarque : Je déconseille d’installer IECollection sur une machine avec IE6 car cela a corrompu de mon IE6 natif (mêmes symptomes que le commentaire suivant “multiple blank ie6 browser windows open and i can not use it“).

Source : Tester fiablement ses navigateurs | BrainCracking – Veille technologique sur les applications Web.

Développement Web

Commentaires imbriqués en CSS = impossible

October 23rd, 2010

Question : Est ce qu’il est possible d’utiliser des commentaires imbriqués en CSS ?
(C’est à dire créer un commentaire généralement multi-lignes contenant un autre commentaire).

Réponse : Non, “The CSS specification is very explicit on nested multi-line comments and how they are NOT supported”

Source : http://www.nixer.org/nesting-multi-line-comments-css