XML file opening.

[newguy]

I have a modal form that takes care of settings and options, I have 8 diff methods that open the file to make changes. My question; can and would it be ok to just open the file once(form load) make changes, save file(form closing)?
Speed is not the major concern as most of these methods run in less than 10 ms (per stopwatch). Good, Bad or Ugly?

 

[Tom]

Oh and another quirk with the memory, run it high and then minimize the app window, it then wipes the memory clean from the task manager.