column order in datagrid with object list

I have an app that I am wrting and I want to use a datagrid.  I am trying to populate it with an object arraylist.  I did it alot like this example http://www.c-sharpcorner.com/Code/2004/June/ObjectDataGridBinding.asp.  What I can't figure out is how I can order the columns how I want.  Any help is greatly appreciated.