How to Achieve Asynchronous Client Socket in Asp.net with out fail

Hi All,

I have developed one simple application like client and server in asp.net .
1) server is console application and Client is Asp.net website.
2) How it  is work  from client has send the request to server then server will return result to perticular action like. i am followed this link for 
http://msdn.microsoft.com/en-us/library/bew39x2a.aspx Asynchronous client socket but it is working when i run as console /winform it return different reults each different request . but in that same code when i try to use it in asp.net it return same result.

it means when i try to run the webpage in 2 or more browser at a time with different request but i ll receive only first request results it wont wait for the next request.
how can i  achieve this in asp.n ...