thanks friend for helpin me.
i solwed it.
cause for the error is, when i create web service i have to choose "localhost" . but i choosed "file systems"
thanks anyway....

i simply create a webservice (Add two numbers) in a ASP.NET page usin vb.net 2005. when i run it usin vb.net it runs using some "localhost port"(ex:-"http://localhost:1543/........").so then i can access those methods using that url.but i cant access that from an another machine by typing my IP Address and other <service>.asm x page.
my simple Service is:-
*************** *************** *************** *************** *************** *************** *...