Covariance and Contravariance in C# 4.0

Over the last couple of days I have read a number of blogs on the topic of covariance and contravariance, a new feature to be introduced in the upcoming C# 4.0 release. Whilst most of the blog posts were happy to provide a detailed account of what these terms…

Pattern for dealing with null handler for events in C#

If you’ve used events in C# before, you’ve probably written code like this too:

[code lang=”csharp”]
public event EventHandler Started;
…
// make sure Started is not null before firing the event
// else…