Web Service Example

This example is 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 Public Function FahrenheitToCelsius (ByVal Fahrenheit As String) As String dim fahr fahr=trim(replace(Fahrenheit,",",".")) if fahr="" or IsNumeric(fahr)=false then return "Error" return ((((fahr) - 32) / 9) * 5) end function Public Function CelsiusToFahrenheit (ByVal Celsius As String) 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.

Explained about example

The first line in the example states that this is a Web Service, written in VBScript, and has the class name "TempConvert":

<%@ WebService Language="VBScript" Class="TempConvert" %>

The next lines import the namespace "System.Web.Services" from the .NET framework:

Imports System Imports System.Web.Services

The next line defines that the "TempConvert" class is a WebService class type:

Public Class TempConvert :Inherits WebService

The next steps are basic VB programming. This application has two functions. One to convert from Fahrenheit to Celsius, and one to convert from Celsius to Fahrenheit. The only difference from a normal application is that this function is defined as a "WebMethod()".

Use "WebMethod()" to convert the functions in your application into web services:

Public Function FahrenheitToCelsius (ByVal Fahrenheit As String) As String dim fahr fahr=trim(replace(Fahrenheit,",",".")) if fahr="" or IsNumeric(fahr)=false then return "Error" return ((((fahr) - 32) / 9) * 5) end function Public Function CelsiusToFahrenheit (ByVal Celsius As String) As String dim cel cel=trim(replace(Celsius,",",".")) if cel="" or IsNumeric(cel)=false then return "Error" return ((((cel) * 9) / 5) + 32) end function

Then, end the class:

end class

**Publish the .asmx file on a server with .NET support, and you will have your first working Web Service.

Learn more How To Use Web Service at http://www.w3schools.com/webservices/ws_use.asp