Is this wrong?

I just got done sweeping up the floors of my apartment since I've allowed some dirt and dust and all sorts of stuff in. I'm looking at the dustpan, and wondering what to do with it. I could attempt to empty it into the plastic bag that has become the garbage for the day - and that may or may not involve me having to resweep the floor. Or I could just dump it out the window. I'm wondering if that would be tacky and/or wrong.