Use custom error pages in ASP.NET

The tag in ASP.NET configuration files affects how error pages are managed in an ASP.NET application and whether developers can redirect users to their custom error pages when an exception is thrown. The syntax for this tag is:


ASP.NET produces an error page when an application throws an unhandled exception or when you deploy an .aspx file whose source contains a syntax error without compiling it inside Visual Studio .NET first. Most of the time, you don’t want this page be visible to your site’s visitors because the source code might contain confidential information, such as the password to access a database, so you should redirect the browser to a custom error page on which you instruct users about error causes and possible remedies. The mode attribute is required and can be one of the following values: Off (ASP.NET always displays its own error pages), On (ASP.NET never displays its own error pages, and developers can define their own custom error pages), or RemoteOnly (ASP.NET displays its error pages only for requests from the local computer and allows custom error pages for requests from remote users). RemoteOnly is the default setting in machine.config and allows you to perform debugging chores while remote users are accessing the site.

Unless the mode attribute is Off, you should provide a defaultRedirect attribute pointing to your custom error page. You can also indicate different URLs for specific HTTP status codes by using one or more subtags, as in this example:

 mode=”RemoteOnly” defaultRedirect=”ErrorPage.aspx” >   

This tips has been taken from Chapter 24 “ASP.NET Applications” of Francesco Balena’s Programming Microsoft Visual Basic .NET (Microsoft Press). Read a sample chapter from our Book Bank, or buy at 30% off the list price.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin


The Latest

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may

man on floor with data

DevX Quick Guide to Data Ingestion

One of the biggest trends of the 21st century is the massive surge in internet usage. With major innovations such as smart technology, social media, and online shopping sites, the internet has become an essential part of everyday life for a large portion of the population. Due to this internet

payment via phone

7 Ways Technology Has Changed Traditional Payments

In today’s digital world, technology has changed how we make payments. From contactless cards to mobile wallets, it’s now easier to pay for goods and services without carrying cash or using a checkbook. This article will look at seven of the most significant ways technology has transformed traditional payment methods.