将javascript对象传递给asp.net codebehind方法并解析它的最简单方法是什么?

I use PageMethods object to call a codebehind method in asp.net. I can send and receive parameters like string, int etc. But i must send a javaScript object to codeBehind. How can i parse the parameter and get data from codeBehind? I think i must use JSON parser but i wonder if there is an easy way, or if .net framework has Json parser (or like JSON) ?I use PageMethods object to call a codebehind m