Lots of things you could say. Most simply: I am very sad, but I will not cry. Or with the contraction: I am very sad, but I won't cry. Using the infinitive: I am very sad but I'm not going to cry. Or a way to express that you don't want to cry, but it is possible that you might: I am very sad but I'll try not to cry.

It's not quite correct. There are both correct: (a) "I am very sad, but I will not cry." (b) "I am very sad, but I will try not to cry." It would be a little more natural to use contractions here: (a) "I'm very sad, but I won't cry." (b) "I'm very sad, but I'll try not to cry." (a) expresses certainty: I _will_ not cry. (b) expresses some doubt. I will try not to cry, but I might cry.

There are two sentence,,,one is ...I will not crying ,,,,and second is i am not crying,,,thinks you