Explain the steps of acquiring a proxy object in web services.

• Client communicates to UDI node to retrieve a list of available web services that the client has access to.
• Every service listed has a URI pointing to the service's DISCO or WSDL document, which is needed to access the webservice and its 'webmethod" methods.
• After interpreting the DISCO document, follow the URI for the WSDL document related to the chosen webservice.
• Client then adds and parses the WSDL document and creates a proxy object which can then communicate with Webservice and access its "webmethod" methods.

Explain the steps to create a web services and consume it.

Steps to create and consume a webservice

Creation:

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

Consumption or Usage:

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