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Since 1998, DevX has helped people start businesses, build websites, and provide enterprise technology to people globally. Interviewing the likes of Microsoft’s co-founder, Steve Ballmer, the publication brings comprehensive, reliable, and accessible insights to the Internet.
To send email over SMTP asynchronously, create a SmtpClient, call its SendAsync method, and add a SendCompleted event handler to your code: //Call the SmtpClient SendAsync method SmtpClient client =
ecently, there has been a revival of interest in domain-specific languages (DSLs). Not only are these languages able to provide a higher level of abstraction over a specific domain (and
he world of enterprise Java has an overwhelming array of choices for remoting: RMI, XML/SOAP, REST/JSON, etc. Each comes with its own industry-acknowledged strengths and weaknesses, such as complex setup
he RDF data model gives you a way to add attribute name/value pairs to any resource that you can reference with a URI. This makes it easy to create metadata
indows Presentation Framework (WPF) gets a lot of mileage out of being layered on top of DirectX, including fast rendering, multimedia support, audio, video, and more. One of the features
eflection, dynamic proxies, and annotations are far from new capabilities in Java, having been introduced in JDK 1.1, 1.3, and 1.5, respectively. Lately, though, I’ve witnessed a spectacular combination of
Suppose you have a CSS style defined as class=”myClass” as shown below: Now suppose you want to know exactly how the myClass style definition is defined. Just place your cursor
Error: Undeclared Identifier Example error message: doy.cpp: In function ‘int main()’: doy.cpp:25: ‘DayOfYear’ undeclared (first use this function) doy.cpp:25: (Each undeclared identifier is reported only once for each function it
You can use the following server-side code to get the name of the currently executing ASP.NET page (e.g. default.aspx, hello.aspx). string sPagePath = System.Web.HttpContext.Current.Request.Url.AbsolutePath; System.IO.FileInfo oFileInfo = new System.IO.FileInfo(sPagePath); string
In XAML, you can hook an application-level event that will fire whenever an unhandled error occurs anywhere in your application by overriding the OnStartup event in the App.xaml.cs file. Here’s
The HttpWebRequest object makes it easy to check whether a web site is available or a URL is valid. Its HttpStatusCode property returns the status code from the request, which
In some cases, the JavaScript triple equals sign operator can simplify variable type and value checking. The operator tests both type and value for equivalency. Here’s a simple example HTML
ugmented Reality (AR) seems to be on everyone’s radar. For the two of you who haven’t watched a YouTube video about it: Augmented Reality is the ability to overlay location
very declaration of an enum type must be a complete definition containing a full list of its enumerators. However, in some use cases declaring an enumeration without providing the enumerators
ne of the first things you will learn about when you begin programming iPhone projects is view controllers. Beginners often get intimidated by the amount of work they need to
espite having a good understanding of the term null, most developers still fail to adequately accommodate null values in their databases. Accommodating null values appropriately is an important part of
Visual Studio makes it simple to add an installer class to your Windows service. Here are the steps: Open the “Solution Explorer” (press Ctrl-Alt-L, or go to the “View” menu
The BackgroundWorker class in the System.ComponentModel namespace (in the .NET Framework 2.0 and later) lets you launch time-consuming operations on a separate thread, which helps keep your user interface (UI)
When you need to bind a Hashtable to a DropDownList control, rather than iterating through all the items in the Hashtable, creating ListItem objects, and adding them to the Items
Often, when you need to get the maximum or minimum value for a specific column, you are also interested in getting more data about those particular rows, so you end
Merging typed DataSets can cause a “Merge Constraint” error, which explains the problem, but doesn’t help much in solving it. Here’s how to find the exact cause of the error:
he previous article on WPF 3D development showed examples that all use relatively simple single-color materials. The material’s brush determines its color. But WPF also allows you to make materials
he Mini CMS system begun in the first article in this series needs to have some base components that represent the actual workplace. These will support loading and showing modules
?year ago, everyone was all but certain that the C++0x standard was just around the corner, and that it would include concepts (see Danny Kalev’s earlier interview with Bjarne Stroustrup,
ou risk a great deal by neglecting your database. Without routine maintenance, a growing database becomes lethargic. As performance degrades, the potential for errors or a system crash increases. At
HP Rules is a rule engine that lets you separate conditional logical statement from your source code and from the database, placing the conditional logic in reusable files, where you
Let SQL Server tell you which queries take the longest to run. The following query returns the five longest-running queries. You can change the TOP 5 to whatever number best
If you need a progress bar in your VB6 application, but don’t want to add the reference to Microsoft Windows Common Controls, here’s a simple way to create a progress
This tip applies to VS project files for .NET languages such as C#, VB.NET, and Managed C++. Follow these steps to edit a project file: In the context Menu of
Using the guard mechanism in multi-threaded applications instead of explicit Lock and Unlock instructions can save you from a number of undesirable synchronization problems. Developers writing multi-threaded applications often fall
