How to Parse Data Into a Class

I've looked at using them when we were importing huge amounts of data, where some of the data was valid and some of it wasn't based on different criteria. And then you finally got down to the handful of stuff that just couldn't be handled. It's like, now do you want to fix this in some other way? Do you just want to throw it out? But at no point will you writing all of these exception cases. I mean, another example I've sort of come up with recently was the idea of trying to turn names into a class.