File processing in FIle adapter

Hi,

i have configured Sender File Adapter (FTP) in my scenario which picks the file from FTP folder and sends to JDBC.

now i have 2 flat files in my FTP (yesterdays and todays). file names are test_07062010 and test_08062010.

now my requirement is while processing the files, my file adapter has to process first file as test_07062010 and then test_08062010. but now it is processing first test_08062010 and then test_07062010. due to this yesterdays data is overwriting on todays data in Database.

i know we have some option in file sender adapter (NFS)...but i need to do with FTP file sender...please let me know how to proceed further.

Thanks in Advance.