How to delete child node LINQ

Hi,
     I have a table as below.
id name parentid 1 a 0 2 b 0 3 c 1 4 d 1 5 e 3 6 f 3 7 g 6 Now, if i delete id 1, it should delete all the child nodes { 3, 4, 5, 6, 7} in the same table and same structure. This is not limited, it should do upto n child of child. Please specify me code snippets or references.

Thanks