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<h1>Web Service Example</h1>
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<p class="intro">Any application can have a Web Service component.</p>
<p class="intro">Web Services can be created regardless of programming language.</p>
<hr />
<h2>An example ASP.NET Web Service</h2>
<p><b>In this example we use ASP.NET to create a simple Web Service.</b></p>
<table class="ex" width="100%" border="1"><tr><td>
<pre><%@ WebService Language="VBScript" Class="TempConvert" %></pre>
<pre>Imports System
Imports System.Web.Services</pre>
<pre>Public Class TempConvert :Inherits WebService</pre>
<pre><WebMethod()> Public Function FahrenheitToCelsius
(ByVal Fahrenheit As String) As String
dim fahr
fahr=trim(replace(Fahrenheit,",","."))</pre>
<pre>if fahr="" or IsNumeric(fahr)=false then return "Error"</pre>
<pre>return ((((fahr) - 32) / 9) * 5)
end function</pre>
<pre><WebMethod()> Public Function CelsiusToFahrenheit
(ByVal Celsius As String) As String
dim cel
cel=trim(replace(Celsius,",","."))</pre>
<pre>if cel="" or IsNumeric(cel)=false then return "Error"</pre>
<pre>return ((((cel) * 9) / 5) + 32)
end function</pre>
<pre>end class
</pre>
</td></tr></table>
<p>
This document is a .asmx file. This is the ASP.NET file extension for XML Web
Services.
</p>
<hr />
<p><b>To run this example you will need a .NET server.</b></p>
<p>
The first line in this document that it is a Web Service, written in VBScript and the
class name is "TempConvert":
</p>
<table class="ex" width="100%" border="1"><tr><td>
<pre><%@ WebService Language="VBScript" Class="TempConvert" %></pre>
</td></tr></table>
<p>The next lines imports the namespace "System.Web.Services" from the .NET
framework.</p>
<table class="ex" width="100%" border="1"><tr><td>
<pre>Imports System
Imports System.Web.Services</pre>
</td></tr></table>
<p>The next line defines that the "TempConvert" class is a WebService
class type:</p>
<table class="ex" width="100%" border="1"><tr><td>
<pre>Public Class TempConvert :Inherits WebService</pre>
</td></tr></table>
<p>The next step is basic VB programming. This application has two functions.
One to convert from Fahrenheit to Celsius, and one to convert from Celsius to
Fahrenheit. </p>
<p>The only difference from a normal
application is that this function is defined as a "WebMethod". </p>
<p>Use "WebMethod"
to mark the functions in your application that you would like to make into web
services.</p>
<table class="ex" width="100%" border="1"><tr><td>
<pre><WebMethod()> Public Function FahrenheitToCelsius
(ByVal Fahrenheit As String) As String
dim fahr
fahr=trim(replace(Fahrenheit,",","."))</pre>
<pre> if fahr="" or IsNumeric(fahr)=false then return "Error"</pre>
<pre> return ((((fahr) - 32) / 9) * 5)
end function</pre>
<pre><WebMethod()> Public Function CelsiusToFahrenheit
(ByVal Celsius As String) As String
dim cel
cel=trim(replace(Celsius,",","."))</pre>
<pre> if cel="" or IsNumeric(cel)=false then return "Error"</pre>
<pre> return ((((cel) * 9) / 5) + 32)
end function</pre>
</td></tr></table>
<p>The last thing to do is to end the class:</p>
<table class="ex" width="100%" border="1"><tr><td>
<pre>end class</pre>
</td></tr></table>
<p>If you save this as an .asmx file and publish it on a server with .NET
support, you should have your first working Web Service. Like our
<a target="_blank" href="tempconvert.asmx">example Web Service </a></p>
<hr />
<h2>ASP.NET automates the process</h2>
<p><b>With ASP.NET you do not have to write your own WSDL and SOAP documents.</b></p>
<p>If you look closer on our example Web Service. You will see that the ASP.NET
has automatically created a
<a target="_blank" href="tempconvert.asmx@WSDL">WSDL</a> and
<a target="_blank" href="tempconvert.asmx@op=FahrenheitToCelsius">SOAP</a>
request.</p>
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