Using Remoting from Webservice?

Question

Does anyone know how I can use remoting from a webservice. I did one, and it works fine the first time. But when i call the webservice method again it does not work. I tried to catch the error and it showed to be "Channel already registered". I try to register the channel in the constructor but it did not work!! so does anyone know how thos can be done? or lead me to some tutorial? thanks in advance for any help :)