comparing two sets of data

#1
hi,
i want to check whether the two samples can be drawn from the same distribution. can i do it with chi-square test? what are the assumptions i need for it?
if i can't use chi square test - what can i do?

notes about the data sets:
- discrete
- mostly increasing (in particular - not normally distributed)
- about 50-70 participants in each data set.


thanks!! :)