怎么编程关闭进程树

如何编程关闭进程树？
如何找出某进程的关联进程，并关闭他们？

[解决办法]

C# code

Process[] ps=Process.GetProcessByName("qq.exe");foreach(Process p in ps){   p.Kill();}
[解决办法]
Windows does not maintain exact process relationships.
For example:

A spawns B, B spawns C
B is killed, then A and C have no relation to each other.