Thanks Dmitry  for your replay.

I did that using IRasterIO(), but non of the IRasterIO() parameters has
which overview its displaying. (i.e overview number). How can i know which
overview it has displayed? 

I used GetOverview(int). I was able to get the overview numbers. But when i
zoomed to maximum the base image has to be displayed instead of overview if
i am not wrong, which i am not getting the base image number.

am iam thinking in right direction?



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