Filters are pieces of logic that can be attached over controllers or actions which affects the way in which a request get processed. Filters are normally used to perform the common functionalities in an application like authorization, caching and logging. Filters can be applied over actions, controllers or at global level. When the filters are applied at global level they affect all the actions of all controllers. In this article we will learn about the basic things of filters, types of filters, creating custom filters and more.

Exception handling is a serious matter in any application, whether it’s web or desktop. Implementing a proper exception handling is important in any application. In most cases once we catch the exception we have to log the exception details to database or text file and show a friendly message to the user.

In ASP.NET applications, error handling is done mostly in two ways: at local level using try-catch blocks and at global level using application events. ASP.NET MVC comes with some built-in support for exception handling through exception filters. The HandleError is the default built-in exception filter. Unfortunately, the HandleError filter not gives a complete answer to the exception handling problem and that makes us to still rely on the Application_Error event.

In this article, we will learn about the HandleError filter and discuss about the different exception handling mechanisms that will fit to an MVC application.