>>Question: I've always been confused about how the compiler optimizes string concatonation. Should you be using String.Format or String.Concat instead of the way you're doing it? Or will the compiler optimize it?
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>For short strings, as in the demo, i don't think it matters.... but for the most part I use stringbuilder to concat long strings of data.....

AFAIR it is more a question of the no. of strings involved.
Methinks up to 4 operands of type string are better optimized than stringbuffer.