Web Services in ASP.NET

Web Services:

A Web Service is a software service used to communicate between multiple devices on a network. More specifically, a Web service is a software application with a standardized way of proving interoperability between disparate applications. It does so over HTTP using technologies such as XML, SOAP, WSDL and UDDI

•  Web service is a communication between the client and server applications on the World Wide Web.

• Web Services is nothing, but it is one type of service we can be apply to the web application send through soap message. We are using web services through are hosted in IIS Server

• Web service even other languages like java, php application can access the service created by .net this is advantage in web service.

• Web service also one disadvantage Only use for Http protocol not for any other protocol and its only sending data by XML way.

• XML also display by SOAP body

How to create Web Service:

Right click on WebApplication project -> Add -> New Item -> web -> Web Services -> Name (WebService1.asmx) -> Add

It generated like below

In WebService1.asmx.cs file, the code generated in it is the basic Hello World service. The default web service code behind file looks like the following:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Services;

namespace WebApplication

{

    /// <summary>

    /// Summary description for WebService1

    /// </summary>

    [WebService(Namespace = "http://tempuri.org/")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    [System.ComponentModel.ToolboxItem(false)]

    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.

    // [System.Web.Script.Services.ScriptService]

    public class WebService1 : System.Web.Services.WebService

    {

        [WebMethod]

        public string HelloWorld()

        {

            return "Hello World";

        }

    }

}

WebMethod: it is nothing but to expose the webservice  

Then add one method like below: 

[WebMethod]

public int Addition(int a, int b)

{

    return a + b;

}

 If you want to Run the web service, Right click on WebService1.asmx -> click the View in Browse option

Then click on an Addition method link and check its runs properly or not.

Then click Invoke button, it’s get the XML permeate

Access Web service in Another application:

Go another project like NewWebApplication -> Right click on References -> Add Service Reference

Now, after clicking on the Service Reference option, it will show the window given below.

Now click the Discover button.it will show the window given below

The web services added like below in ASP.NET MVC application

Add Controller in NewWebApplication project like HomeController.cs copy the below code in HomeController page

        public ActionResult GetAdditionResult()

        {

            ServiceReference1.WebService1SoapClient obj = new ServiceReference1.WebService1SoapClient();

            ViewBag.Result = obj.Addition(45, 25);

            return View();

        }

WebService1SoapClient is a web service class

Add view for GetAdditionResult method

Click Add button then view is added

Then call the viewbage in view page

@ ViewBag.Result

Then build the application the output comes like below: