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. Introduction to Web Services . . We

embark upon our subject of Web Services with the primary assumption

that you have read either our book on ASP.NET, or any one of the

innumerable others, strewn all over the market. So, we will not

submerge ourselves into every microscopic detail about either the C

programming language or ASP.NET. This book is fully dedicated to the

understanding and building of Web Services, since Microsoft has

precluded all the other options for building commercial applications

for the Net. A Web Service is a piece of program code placed on the

Server, such that it can thereon be accessed or executed by the entire

world. . . Create

a file named a.asmx in the folder c:inetpubwwwroot, with the contents

laid down below. IIS, the web server on our machine, makes this

directory the root or home directory. . . a.asmx . public class zzz . { . public string abc() . { . return "vijay"; . } . } . . Enter the following URL in Internet Explorer: . . Buy Book at Lowest Price on Amazon

. On doing so, an error will be displayed with the following message: . . Output . Parser Error Message: The page must have a <%@ webservice ... %> directive. . . Before

we advance any further, a few fundamental concepts need to be addressed

immediately. Even though the file has the extension of asmx, it has a

striking resemblance to a C program. The error is a fitting testimony

to the fact that the IIS web server is capable of recognizing and

handling files that have the asmx extension. Hence, it seeks out the

WebService directive. This WebService directive provides information to

the web server about the class that represents the functioning of a

WebService. And, since every asmx file must commence with this

directive, we incorporate this directive into the asmx file. . . a.asmx . <%@ WebService Language="C " %> . public class zzz . { . public string abc() . { . return "vijay"; . } . } . . In

C , all the code is encompassed in classes. The class named zzz

contains a function named abc, which returns a simple string of

'vijay'. On entering the URL of http://localhost/a.asmx in Internet

Explorer, a page bursting with information gets displayed. However,

there is no function by the name of abc for execution. . . IIS

is cognizant of the fact that an asmx file encloses code that others

may call remotely. Therefore, on stumbling upon a file with the

extension of asmx, it displays the following large html page: . .

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