Hi there. I work in VB. Net, Visual Studio 2012 Express. My program consists in the fact I need several files (about 20 csv) managed to one csv. The user clicks to load the csv files, which are then exported to a final. That me it works. But these files are updated daily, and I would like to only incremental load data into the final. That would compare the data already in the original, against those of today, and only those would be transferred to the final.