Minor correction

For anyone interested: all these small corrections do not have any effect on the performance (what I and this repository is about: making things working properly against). The first version I uploaded yesterday was fine. In any case, as said, this app has been built pretty quickly (and many intermediate versions were created) and thus there are small bits not completely right (not representing errors, but not looking too nicely). Now I am converting the code into VB.NET, what gives me the opportunity to see each small detail. These small corrections are just this, nothing relevant. The first version I uploaded here and this one does not have any true difference.