Preventing multiple instances of an application from running at the same time is a common requirement, especially for business software. By limiting to a single instance of an application per machine, the task of managing network connections, local and remote resources, client sessions and licensing requirements is greatly simplified. An additional advantage is that it… Continue reading

In an earlier article, I developed a set of managed wrapper classes for the Text Object Model (TOM); the API that underpins the RichEdit/RichTextBox control and provides an object model that is document-centric (rather than selection-centric, like the controls themselves). With it, you can efficiently manipulate rich text and, using the managed classes, do so… Continue reading

This article is also available as a video, courtesy of Webucator. Click here to jump to the video section below.   For many data types, sorting is a logical, deterministic operation that works by comparing elements and determining whether they are less-than, greater-than or equal-to each other. For example, with a list of integers, we can… Continue reading

You may remember quite an old post of mine about the shortcomings of ExtractAssociatedIcon() which, surprisingly, still gets a fair number of hits. In light of some of the feedback i’ve received since the original post, i’ve decided to update the code to include the following fixes and improvements: Both methods in IconTools now use SHGetFileInfo As… Continue reading

I’ve recently been doing a lot of work with the WinForms RichTextBox control, trying to implement the familiar red wavy underlines associated with spell-checking. After some research, I discovered that the underlying (native) RichEdit control used by the RichTextBox does in fact support this style of underlining. The catch? It is only accessible through the… Continue reading