How to obtain the number of living cells!



 I am sorry to waste your time another time; I have to pose another question:
Across the field of vision, both living and dead cells are existing, how can I obtain the number of  living cells?
that needs some Dye?

thank you very much!!!




Your question is a bit unclear. Could you post an image on a public website somewhere, and then explain here at the Forum what it is you are trying to count?