Can anyone tell when to use switch statement and when to if-else-if
construct?

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Do you only care about the performance (given the group you've posted
in) or code style in general?

For performance, I suspect it depends on various things - I wouldn't
like to guess without trying.

For coding style, I tend to prefer to have a switch block if there are
more than two branches - and if the thing naturally lends itself to a
switch to start with, of course. I don't artificially introduce values
which are appropriate for a switch just for the sake of using one.

--
Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet