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8849CH26.qxd  10/10/07  11:46 AM  Page 934

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public int Add(int x, int y)

{ return x + y; }

[WebMethod]

public int Subtract(int x, int y)

{ return x - y; }

[WebMethod]

public int Multiply(int x, int y)

{ return x * y; }

[WebMethod]

public int Divide(int x, int y)

{

if (y == 0)

return 0;

else

return x / y;

}

}

Notice that we have accounted for a division by zero error by simply returning 0 if the y value is

in fact zero. Also notice that we have renamed this service to MathService, and therefore we must

also update the Class attribute in the *.asmx file as so:

<%@ WebService Language="C#" CodeBehind="~/App_Code/Service.cs" 

 %>

At this point you can test your XML web service by running (Ctrl+F5) or debugging (F5) the

project. When you do so, you will find a web-based testing front end that allows you to invoke each

web method (see Figure 26-12).

Figure 26-12.

Testing our MathWebService

At this point you can close down the web service project.