Convert table data to tree structure using C#

Question

Hello

I have table that contains following data

 

id      parentid      name

1        NULL          A

2           1               B

3           1              C

4           1              D

5           2              E

6           3              F

7           4              G

8           6              H

9           6              I

10         7              J

11          8              K

12          9                L

13        10              M

14        15              N

15        7                O

 

I got this data as list now i want to convert this data in tree structure in C# as following format

 

A

-- B

   -- E

-- C

   -- F

      -- H

         -- K

      -- I

         -- L

-- D

   -- G

      -- J

         -- M

      -- O

         -- N