get data from table sql and post it in treeview

Question

i have a problem.....
i have atable sectors and fields sec_ID and sec_name
sec_ID         sec_name
1                  the chairman
11               the manger
111            the employee
and i want to populate this data in Hierarchy (the employee under the manger under th chairmain)
please answer to populate this data using c# and table in sql server  (windows application)
thank to all