Introduction:
In this article,i am to explain about what are the main differences between web services and
windows communication foundation (WCF).

Main:

1.Page Model:

In asmx page we need to maintain a complete set of information that describes how the data
will be formatted,how to wrap a soap header,and how to prepare it to be sent.But it doesn’t
maintain a security.

But WCF enhances quite significantly.

2.TightCoupling:

Web services are tight coupling with the http runtime and the dependence on iis to host it.
But in WCF,we can host using applications,iis and windows service.

3.Instantiation:

Web Service Instantiation: per-call basis

WCF Instantiation: singleton,private session,per call

4.Security:

Web services does not guarantee end-to-end security or reliable communication.

WCF guranteed reliable and security.

We can call web service in wcf application,but cannot call wcf service in asmx.

Conclusion:
Hope this helps,
Happy coding.