Page 231 - DCAP312_WEB_TECHNOLOGIES_II

Unit 11: Web Services in Visual Studio .NET

A Web Service Example Notes
In the following example we will use ASP.NET to create a simple Web Service that converts the
temperature from Fahrenheit to Celsius, and vice versa:
<%@ WebService Language= “VBScript” Class= “TempConvert” %>
Imports System
Imports System.Web.Services
Public Class TempConvert: Inherits WebService
<WebMethod ()> Public Function FahrenheitToCelsius
As String
dim fahr
fahr=trim(replace(Fahrenheit, “,”, “.”))
if fahr= ““ or IsNumeric(fahr)=false then return “Error”
return ((((fahr) - 32) / 9) * 5)
End function
<WebMethod()> Public Function CelsiusToFahrenheit
As String
dim cel
cel=trim(replace(Celsius, “,”, “.”))
if cel= ““ or IsNumeric(cel)=false then return “Error”
return ((((cel) * 9) / 5) + 32)
End function
End class
This document is saved as an .asmx file. This is the ASP.NET file extension for XML Web Services.

Create a Web service.

The SOAP was designed as an object-access protocol in 1998 by Dave Winer,
Don Box, Bob Atkinson, and Mohsen Al-Ghosein for Microsoft, where Atkinson
and Al-Ghosein were working at the time.
Self Assessment Questions

1. ASP.NET server side technology not allows developers to create web services.

(a) True (b) False
2. Web browsers are software applications that allow users to retrieve data and interact with
content located on web pages within a website.

(a) True (b) False
3. ………………………..is one form of client side script that permits dynamic elements on
each page.
(a) Java (b) PHP

(c) JavaScript (d) XML

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