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When I need to join two strings I use String.Format (or StringBuilder if it happens in several places in the code).
I see that some good programmers doesn’t give attention to strings joining complexity and just use the ‘+’ operator.
I know that using the ‘+’ operator make the application to use more memory, but what about complexity?
This is an excellent article about the different string join methods by our own Jeff Atwood on Coding Horror:
(source: codinghorror.com)
The Sad Tragedy of Micro-Optimization Theater
Here is the gist of the post.