Create a sample Webservice in C#

Let me explain with a simple Webservice which has the function to concatenate strings.
Here are the steps below to create a Webservice in ASP.NET using C# :

(1) Open Visual Studio -> Create Project -> ASP.NET Webservice Application

It will create an Application with default Service file as follows :

In this example I have created a webservice method that returns concatenated string as
output.WebMethod attribute makes the function callable from remote Web Clients.

Namespace  "http://tempuri.org/" is a temporary url provided for under development
project.Here we can provide the hosted url of the Webservice.

On running the output is :

.asmx is the file to which webservice url navigates. It contains all functions,its parameters and its return types. On clicking the function it displays a test interface as follows :

The result on clicking Invoke button is :

On clicking Service Description of .asmx, we will get WSDL
(Webservice Definition Language) file which is an xml file that defines the webservice
 and it looks like :

Like normal Websites or Web Applications , Webservices can be hosted in IIS. For eg. if we
host it in local machine url looks like :

http://localhost/WebService1/Service.1asmx