Hi all,

Can anyone guide me what is the actual implementation of a web service in .net framework 2.0?
Does it use the HttpWebRequst or...what is it doing behind scene?
is the web service a persistent connection to server?
is there any limitation on client connection to a server?

roadman:

Can anyone guide me what is the actual implementation of a web service in .net framework 2.0?

web services behind the scene uses a proxy to communicate with the remote end point.

That is what usually happens is the web service exposes the WSDL which describes the interface. A proxy is created out of this WSDL for the client to consume and it makes it look like you are interacting with a local component, however the proxy proxies the request to the remote end point.

roadman:

Does it use the HttpWebRequst or...what is it doing behind scene?

HttpRequest is a way that allows in code to mimic actual web requests like a POST or a GET request to a website.

yes, i know it use proxy to connect to endpoint.
my question is how does the proxy really do in order to connect to the endpoint.
is it using the winsock connection? will this connection has max limit? 

Will the web service call utilize the shdocvw.dll?

My question is originated from a problem that
1. function A in an application uses ws call (.net 2.0) to get sth.
2. function B in the same application use Web Browser Control to navigate to a web page (with ExtJs)

The problem come out that whenever function A is invoked , function B does not

There should be no interference with shdocvw.dll. That's for web browsing, and has nothing to do with web services.

so, how does the actual implementation of web service connection? via winsock? 

I have no idea, and it's not documented anywhere, and shouldn't be. It's an implementation detail subject to change.

If you want to find out, then you should download a copy of Reflector, and take a look.