Which is faster: clear collection or instantiate new

Question

I have some number of generic lists in my code, that have tens or hundreds elements. Sometimes I need to refill this lists with other objects, so question is: what will be f

Answer 1

While this may be frustrating, the answer really is that it shouldn't matter. The time difference between the two is going to be so small that it probably won't make any difference to your application. Do what leads to cleaner, more understandable code, and try not to program for micro-optimizations.