Now that we have learnt some basic stuff about about what web services are  and how they communicate,lets build our first webservice using Visual Studio.I have done this in VS 2008.
First Step: Open Visual Studio.Click on File and then select “New WebSite”.From the Next Window that appears,click ASP>NET Web Service.Select your language and then click OK.
By Default,VS 2008 will automatically create your first WebService “Hello World”.Notice that the Class inherits the System.Web.Services.WebService Class.
public class Service : System.Web.Services.WebService
Also,before the method “Hello World”,a [WebMethod] attributed has been specified.This basically tells the compiller …

Explain .Net Web Service?
A Web service allows you to publish an application’s function on the internet that can be accessed through another application.A very common example is the currency exchange rates available in many web sites.In most of the cases,this module will not even reside on the server on which the web site has been uploaded,but it may be using a webservice that gives the functionality.In Short, Web services are components that can be used by other applications.The definite advantage is reusability and that web services are platform and language …