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Everybody who writes native Windows applications knows that the Windows Forms controls provided by Microsoft are a great time-saver for oft-used interface components such as text boxes and drop-down lists. But sometimes we need a reusable form control that does things Microsoft hasn't pre-built for us. Learn to extend existing Windows Forms controls with custom functions that will save you time.

The Ultra-Mobile PC (UMPC) presents a new opportunity for existing applications to extend their potential audience. Microsoft Windows desktop applications can mobilize onto the UMPC platform, providing users with desktop functionality while on the move. Windows Mobile? device applications can take advantage of the larger screen size and storage space of the UMPC to extend the application capabilities.

We've offered a few solutions for working with web cams within .NET to create fun and intriguing monitoring applications. In this article, we extend those ideas so that web cam images can be shared with multiple clients over the Web.

VSTO brings you the full feature set of Visual Studio including LINQ, WPF, WCF, and the .NET Framework 3.5.

Charles Petzold shows how to extend the limited fluid UI capabilities of Silverlight 4 with new techniques so you too can dazzle users with those cool object entrances and transitions.

Generic dictionaries simplify common tasks, such as coordinating selection between a TreeView and a ListView—but their capabilities extend far beyond that, once you realize you can use DynamicInvoke() to execute delegates stored in the dictionary.

Working with big applications requires extending the Microsoft ASP.NET 2.0 Membership API to handle more detailed member records.In this article, I'll present one of the available techniques used to extend the Microsoft ASP.NET 2.0 Membership API to solve some of the limitations of that API.

As discussed in earlier installments of this article series - most notably in An Introduction to LINQ and The Standard Query Operators - one of LINQ's primary components is its set of standard query operators. A query operator is a method that operates on a sequence of data and performs some task based on that data, are implemented as extension methods on types that implement the IEnumerable<T> interface. Some of the standard query operators that we've explored throughout the articles in this series include: Count, Average, First, Skip, Take, Where, and OrderBy, among others.

While these standard query operators provide a great detail of functionality, there may be situations where they fall short. The good news is that it's quite easy to create your own query operators. Underneath the covers query operators are just methods that extend types that implement IEnumerable<T> and iterate over the sequence performing some task, such as computing the total number of items in the sequence, computing the average, filtering the results, or ordering them. This article examines how to extend LINQ's functionality by creating your own extension methods.

Don't build logging capabilities for your applications from scratch; you can get robust and flexible logging functionality for your .NET applications with the free open source log4net framework, and then extend it to support custom needs.

In this article, I'll describe how to extend the ImageBox control discussed in earlier articles to be able to display PDF files with the help of the GhostScript library and the conversion library described in the previous article.Getting StartedYou can download the source code used in this article f