Weight paint front and back faces at the same time I want to know how to weight paint the back and front and sides of the selected region at once instead of keep changing the view then doing the same thing. So for example if we have a cube in front view and I pressed the B to select the bounding box, and I selected the area where the cube is located, what I want to be done is to select everything in this bounding box in all views, so in this case will be the whole cube. 
I have tried enabling and disabling the limit to selection option but still only the front faces are selected.
It sounds like you need to uncheck limit selection to visible at the bottom of the 3D view.  When this is selected you can only paint or select geometry that is visible.



What limit to selection does is only let you weight paint geometry which is selected in edit mode.  So be sure that if this is enabled you have gone into edit mode and selected what you want to weight paint.