How to get a tree of using list?

   In winFX, I want to get a tree of using list(Collection).

 level                           fullname

  0                               A

  1                              A.B

  2                              A.B.C

  2                              A.B.D

  1                              A.E

 new list list0(A)

 new list list1(B)

new list list2(C)              

     list1.Add(C)   store D into list2

     list1.Add(D)    list0.Add(B)

    store E  into list1

Can you help me Thank you !

showing

 A

        B

              C

               D

       E