Question 351 – What is a Web Service?

• It is an application that is designed to interact directly with other applications over the internet.
• In simple sense, Web Services are means for interacting with objects over the Internet.
• It provides a standard means of interoperating between different software applications, running on a variety of platforms and/or frameworks.
• Web Service is
• Language Independent
• Protocol Independent
• Platform Independent
• It assumes stateless service architecture.

Question 352 – What are the Examples of Web Service?

• Weather Reporting
• Stock Quote
• News Headline

Question 353 – What are the Advantages of Web Service?

• Interoperability – This is the most important benefit of Web Services
• Usability – Web Services allow the business logic of many different systems to be exposed over the Web.
• Reusability – Can be used across the systems
• Deployability – Web Services are deployed over standard Internet technologies
• Message sent via HTTP, so will be transported without being blocked by firewall.

Question 354 – What are the DisAdvantages of Web Service?

• Since its over internet there is not guarantee for 100% availability
• Since its passed over http protocol, it can be easily tampered

Question 355 – What are the Steps to Create a Webservice?

• Create a new website by selecting "ASP.NET Web Site" and giving it a suitable name.
• service.cs file appears inside the solution with a default webmethod named as "HelloWorld()"
• Right click on the webservice project and add a web reference instead of adding a normal reference.
• A window appears that displays a list of webservices knows to the solution.
• Click on "Webservices in this solution"
• a search progress bar appears and
• Select the service that appears in the list
• progress bar appears once again.
• web method appears on the screen
• Click on "Add reference" button. This would add localhost
• solution would have App_WebReference folder

Question 356 – What are the Steps to Consume a Webservice?

• Add a UI (.php) to the webservice project
• Add a button and a label to the form
• Double click the button to see the click event of the button
• Create an object of type service localhost.serviceName
• Write code to display the value returned by the webmethod on the label
• Execute the solution by setting the added aspx as the startpage.
• click on the button and the message "Hello World" would be displayed on the label

Question 357 – What is a Proxy class?

• It is a code that looks exactly like the class it meant to represent;
• Proxy class doesn’t contain any of the application logic. Instead, the proxy class contains marshalling and transport logic.
• A proxy class object allows a client to access a web service as if it were a local COM object.
• The Proxy must be on the computer that has the web application.

Question 358 – What is SOAP?

• SOAP stands for Simple Object Access Protocol
• A better way to communicate between applications is over HTTP, because HTTP is supported by all Internet browsers and servers. SOAP was created to accomplish this.
• SOAP provides a way to communicate between applications running on different operating systems, with different technologies and programming languages.
• SOAP is a communication protocol
• SOAP is for communication between applications
• SOAP is a format for sending messages
• SOAP communicates 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 recommendation

Question 359 – What is UDDI?

• It is Universal Description, Discovery, and Integration
• It describes a set of standards that XML web service providers should follow to advertise the fact that their web service exists. 
• It is a directory for storing information about web services
• It is a directory of web service interfaces described by WSDL
• It communicates via SOAP
• It is built into the Microsoft .NET platform.
• It provides a standardized method for publishing and discovering information about web services.

Question 360 – Where UDDI is used in real time?

• UDDI has several different uses, based on the perspective of who is using it.
• From a business analyst’s perspective, It is similar to an Internet search engine for business processes.
• Software developers use the UDDI Programmer’s API to publish services and query the registry to discover services.

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