In the previous blog post you learned about different ways to do a null check. The traditional way is to use the == operator:

What is the classic way to check if for example a parameter value is null? If you've developed with C# since a while, you might be familiar with this classic syntax:

Recently there was a discussion in a Pull Request for the .NET runtime on GitHub. In the discussion it was mentioned by Jan Kotas from Microsoft that the order of interfaces is important for the casting performance.