Bespoke Digital Media, a UK based digital agency provides web and software services.

1. Introduction to Web Services
Bespoke Digital Media
India Pvt. Ltd

2. 2
Agenda
 What is a Web service?
 Technologies used
 XML, SOAP, WSDL, DISCO, and UDDI
 Walkthrough creating a Web service
 Walkthrough creating a Web service client
 References
 Q&A

3. 3
What is a Web Service?
 A programmable application component that
is accessible via standard Internet protocols
 Web page with functions
 Available for a variety of clients
 Examples: stock quotes, traffic conditions,
calculators, news, weather, et cetera

4. 4
Technologies Used
 Standard way to represent data
 XML (and XML schemas)
 Common, extensible message format
 SOAP
 Common, extensible contract language
 Web Services Description Language (WSDL)
 Way to discover site services
 Disco
 Way to discover service providers
 Universal Description, Discovery, and Integration (UDDI)

5. 5
XML
 Extensible Markup Language
 Language for describing documents with
structured data
 Industry standard
 XML Schemas – XSD
 XML based
 Language for describing data types
 For more information, read:
http://msdn.microsoft.com/library/en-us/dnwebsrv/html/xmloverchap2.asp

6. 6
SOAP
 A simple, XML-based protocol for
exchanging structured and type information
on the Web
 Industry standard
 Lightweight and XML-based protocol
 Can support different protocols and formats:
HTTP, SMTP, and MIME
 SOAP message
 For more information, read:
http://msdn.microsoft.com/soap/

7. 7
WSDL
 It is an XML document describing Web
services
 Define data types (XSD)
 Define messages in terms of types
 Define bindings to transport protocol, message
format
 SOAP 1.1, HTTP Get/Post, MIME
 Define services as collections of ports
 WSDL.exe
 For more information read:
http://msdn.microsoft.com/library/en-us/dnwebsrv/html/wsdlexplained.asp

8. 8
DISCO
 Document Discovery
 A client finds a particular Web services by
discovery
 Document discovering services at a
particular URL
 Document is in XML format
 Document has .disco and .vsdisco
extensions
 Disco.exe

9. 9
UDDI
 Universal Description, Discovery, and Integration
 Enables businesses to publish and discover
information about who provides what services
 Specification for distributed Web service
registries: white pages, yellow pages, and
green pages
 Builds on HTTP, XML, and SOAP
 For more information, read:
http://msdn.microsoft.com/library/en-us/dnexxml/html/xml12182000.asp
http://www.uddi.org/about.html

10. 10
ASP.NET Web Service
 Leveraging existing ASP developers
 Easy to build, deploy, and administer as a
Web application
 File extension is .asmx
 End point is represented by URL

11. 11
Creating a Web Service
 Open Microsoft Visual Studio® .NET
 Select the language
 Select the project type: ASP.NET Web Service

12. 12
Creating a Web Service
 .asmx and .asmx.cs
 Web.config
 Global.asax

13. 13
Creating a Web Service
 Inside Service.asmx
 <%@ WebService Language="C#"
CodeBehind="~/App_Code/Service.cs"
Class="Service" %>

14. 14
Creating a Web Service
Inside Service1.asmx.cs
 Add WebService attribute’s Namespace
property
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 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 Service : System.Web.Services.WebService
{
public Service () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public string HelloWorld() {
return "Hello World";
}
}

15. 15
Creating a Web Service (5)
 Compile the Web service & running

16. 16
Creating a Consume web service
 Create a Web Site with C#

17. 17
Creating a Consume web service
 Add Web reference

18. 18
Creating a Consume web service
 Proxy file is created: Reference.cs

19. 19
Creating a Consume web service
 Client code
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
localhost.Service sr = new localhost.Service();
Response.Write(sr.HelloWorld());
}
}

20. 20
Creating a Consume web service
 Run the Web service client

21. 21
Summary
 What is a Web service?
 Technologies used
 XML, SOAP, WSDL, DISCO, and UDDI
 Walkthrough of creating a Web service
 Walkthrough of creating a Web service client
Start building Web services today!

22. 22
References
 Programming the Web with XML Web
services
Visual Studio .NET Help
ms-help://MS.VSCC/MS.MSDNVS/vsent7/html/vxconProgrammableWebServices.htm
 XML and SOAP Serialization
Visual Studio .NET Help
ms-help://MS.VSCC/MS.MSDNVS/cpguide/html/cpconserialization.htm
 Web Services Community
Go to http://msdn.microsoft.com/newsgroups/managed/default.asp
On left frame, drill down to
.NET Development > Framework > dotnet.framework.aspnet.webservices

23. Thanks..
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