can the case be changed while uploading the data or after uploading ????

hi all ,

can u pls help me ??? can the case of the data in a itab be changed while running the program? the data is uploaded to an internal table and then based on loop at that itab the conditions will evaluate to give the result.... but the problem is like wen the data is given in small letters the worste(last) condition is executing even the data satisfies the condtion which is not supposed to happen. this is due to case sensitive problem ...can u pls help me ....can the case be changed while uploading the data r after uploading ????