iron speed: upload a file to file system and save the location in database...[phase two] cont...

i'm having no luck with the problem. it should have been a piece of cake. it has turned up to be a very hard nut to crack. the only update of my situation here is, i just accidentally clicked on code documentation instead of code customization which was just next to it. I was just having a look then i came across to this image of the class hierarchy...may be it will help.....