How to send user defined data types to asmx web service from android application?

Hi friends,
 
I want to pass a user defined data type(a complex data type- an object say) to asmx web service from my android app. I have tried of sending primitive data
 
types and works fine. When I am trying to send the object it self as it is then I got the following error. (See link below)
http://pastie.org/5935960[^]
 
and here is the code I am using to call the web service http://pastie.org/5936733[^]
 
and this is my class Implementation http://pastie.org/5936414[^] and
 
another class implementation is here http://pastie.org/5936586[^]
 
Note: Every thing works fine when I send the data with primitive data types but when I send the data with my class object it is throwing an exception.
 
Please any onc could try to tell me what may be the problem. I was on this problem for last 4 days but could not resolve it still.
 
Thanks
Ganesh