Articles on ASP.NET

XAspFilter 1.0

ASP.NET sends two additional HTTP headers that give away too much information - this ISAPI filter removes them. Source code included.

In a Class of its own - the .NET Zip Library

The .NET Framework contains several hundreds of classes, yet something is missing: there is no class for compressing and decompressing Zip archives. This omission however can be made up for by using the .NET Zip Library (NZipLib) - it supports Zip as well as GZip format, is free, and comes with C# source code included.

Obtaining Image Information on your own

A frequent problem in uploading image files is that the size (width, height) isn't known and that consequently you have to determine them on your own. With help from the .NET Framework, everybody can program his own ImageInfo component without this project turning into an inordinate effort - you just have to use the Bitmap class to your advantage. And presto - we have size information for 12 image file formats!

Programming the Sending of Emails yourself

There are (almost) as many email components as there are grains of sand on a beach, and many of them even are free. Certainly (almost) everyone has used them, be it AspMail, CDONTS, SA-SmtpMail or one of many others. Something that (almost) no one has done up to now is programming his or her own email component. In today's article we will concern ourselves with the basics and send a very simple email message. In future articles we will build on the source code presented today and will finally have a fully functional component for HTML emails and attachments.

Sending Email with ASP.NET

Something found on every web page today is an email form. In all probability this will not change anytime soon, therefore I will demonstrate today how to send email via ASP.NET: from plain to HTML mail and attachments.

Using COM components in ASP.NET

In this article the author deals with a topic of interest for most new convertites to ASP.NET: how can I use my own or third party COM components in the ASP.NET environment?

Uploading Files with ASP.NET

Something that could not reasonably be done under ASP without a third party component was the uploading of files to the web server even though the uses of this feature range from content management systems to online cost estimates for translations (based on the content of uploaded files).

Directory Browsing the .NET Way

From the 'Good Old Times' of ASP programming, many should remember the FileSystemObject object. It allows access to the file system for reading, writing and directory browsing. However, the object model is anything but perfect, and there are some other functions and properties which I would have liked to have. It looks as if these wishes would be fulfilled by the .NET Framework classes in the System.IO namespace. File processing was never easier and above all never more powerful.

Displaying Event Log Entries the ASP.NET Way

Under Windows 2000 (or NT) the Event Log is about the most important source of information for the administrator because all events that occurred are logged there - from success to catastrophical failure. And as it is so important, what would be more obvious than to make it accessible via the web?

WHOIS queries the .NET way

Quite often you want to know who owns a given domain. To obtain the registry information, you go to the respective registry (DENIC, Network Solutions etc.) and start a so called WHOIS query (lookup). The trick is that you have to know which registry is responsible for for which TLD (Top Level Domain). Even if you had all the TLD/registry information - you'll never remember the URLs of the query pages. There is no uniform one - yet! In today's article such a page is just what we will code.

Performance Monitoring the .NET Way

In today's article I will show you how easy it is in ASP.NET to read performance counters - using the System.Diagnostics Namespace of the .NET framework. You don't need external components like in ASP, but get even more functionality instead. You can even reconstruct parts of the NT performance monitor without spending too much time on it.

Generating graphics on the fly

Something that cannot be done in ASP without support by an external component is dynamic creation of graphics - be it a diagram, a banner or just a simple graphical counter. This fortunately has changed for ASP.NET - using built-in means, graphics can be created dynamically and sent to the client with a maximum of configurability and ease.