How to Uncheck all Nodes of TreeviewCheckbox using c# coding

Hi Friends,


            I am using Treeview Control with Checkbox in my windows application , i want to uncheck all the checkbox in Treeview but WITHOUT using FOR LOOP. If i use FOR LOOp means its taking long time if i have vry large data means , So can any one suggest me to Uncheck all Nodes and ChildNodes in Treeview WITHOUT using FOR LOOP. :) Thanks in Advance. :)