how to create webservice in asp.net 2005


WEB SERVICES

What are Web Services?

  • Web services are application components
  • Web services communicate using open protocols
  • Web services are self-contained and self-describing
  • Web services can be discovered using UDDI
  • Web services can be used by other applications
  • XML is the basis for Web services

The HTTP protocol is the most used Internet protocol.

Web services platform elements:

  • SOAP (Simple Object Access Protocol)
  • UDDI (Universal Description, Discovery and Integration)
  • WSDL (Web Services Description Language)

We will explain these topics later in the tutorial.

Web Services have Two Types of Uses

Reusable application-components.

There are things applications need very often. So why make these over and over again?

Web services can offer application-components like: currency conversion, weather reports, or even language translation as services.

Connect existing software.

Web services can help to solve the interoperability problem by giving different applications a way to link their data.

With Web services you can exchange data between different applications and different platforms.


What is SOAP?

SOAP is an XML-based protocol to let applications exchange information over HTTP.

Or more simple: SOAP is a protocol for accessing a Web Service.

  • SOAP stands for Simple Object Access Protocol
  • SOAP is a communication protocol
  • SOAP is a format for sending messages
  • SOAP is designed to communicate via Internet
  • SOAP is platform independent
  • SOAP is language independent
  • SOAP is based on XML
  • SOAP is simple and extensible
  • SOAP allows you to get around firewalls
  • SOAP is a W3C standard

Read more about SOAP on our Home page.


What is WSDL?

WSDL is an XML-based language for locating and describing Web services.

  • WSDL stands for Web Services Description Language
  • WSDL is based on XML
  • WSDL is used to describe Web services
  • WSDL is used to locate Web services
  • WSDL is a W3C standard

Read more about WSDL on our Home page.


What is UDDI?

UDDI is a directory service where companies can register and search for Web services.

  • UDDI stands for Universal Description, Discovery and Integration
  • UDDI is a directory for storing information about web services
  • UDDI is a directory of web service interfaces described by WSDL
  • UDDI communicates via SOAP
  • UDDI is built into the Microsoft .NET platform

Example : FirstService.asmx

<%@WebServicelanguage=”C#”class=”FirstService”%>

using System;

using System.Web.Services;

using System.Xml.Serialization;

[WebService(Namespace=http://localhost/MyWebServices/&#8221;)]

publicclassFirstService : WebService

{

[WebMethod]

publicint Add(int a, int b)

{

return a + b;

}

[WebMethod]

publicint Substract(int x,int y)

{

return x-y;

}

[WebMethod]

publicString SayHello()

{

return“Hello World”;

}

}

 

ASP.NET Button Click EVENT

 

protectedvoid Button1_Click(object sender, EventArgs e)

{

FirstService mySvc = new FirstService();

Label1.Text = mySvc.Substract(Int32.Parse(TextBox1.Text), Int32.Parse(TextBox2.Text)).ToString();

}

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