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<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <asp:ScriptManager ID="ScriptManager1" runat="server"> <Services> <asp:ServiceReference Path="Authors.asmx" /> </Services> </asp:ScriptManager> <h2> Get Author Page </h2> <asp:TextBox ID="TextBoxAuthId" runat="server"></asp:TextBox> <br /> <input id="Button1" type="button" value="Get" onclick="GetAuthor()" /> <hr /> <asp:Label ID="LabelResults" runat="server" Text=""></asp:Label> </asp:Content>

Notice that in this markup, the GetAuthor JavaScript method defined earlier is called when the user clicks the Get button. This triggers the web service. The results are returned to the FinishCallback JavaScript method and then displayed in the Label control. Figure 10-6 shows the call in action.

You will often need to authenticate callers to your XML web services hosted by ASP.NET. To do so, you can use one of the standard ASP.NET security methods to authenticate and authorize users. This is similar to securing any ASP.NET resources, such as webpages, directories, or other files. Alternatively, you can use Web Services Enhancements (WSE) 3.0 to build secure XML web services.

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WSE was written as an add-on product to the .NET Framework and provides developers with an easy solution for securing web services. It is based on standards and hence will usually work across platforms. If you need to create secure XML web services, WSE 3.0 is a preferred solution. For more details, go to http://msdn.microsoft.com/en-us/library /ms977317.aspx.

Or they can create components in a different language the NET Framework supports, if that better suits their needs 7.

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There several ways in which you can use the authentication and authorization methods of ASP.NET to secure your XML web services. Fortunately, these techniques are not much different from those used to secure other ASP.NET resources, because the web service works much like a webpage. Both web services and webpages have a URL that points to a file. You can therefore lock down this file as you would any ASP.NET resource. Configuring and setting up ASP.NET security is similar for both web services and ASP.NET pages and is covered in 13, Implementing User Profiles, Authentication, and Authorization.

To set up this test lab, you will need the following hardware and software:

You can also review the How to: Configure an XML Web Service for Windows Authentication section on MSDN for additional information. See http://msdn.microsoft.com/en-us/library /bfazk0tb.aspx.

To pass basic authentication credentials from your web server to a web service, you first create a NetworkCredentials class. This class contains the user name, password, and domain information. You can then create a CredentialCache object to which you add the NetworkCredentials instance. You then set the web service s generated client proxy s Credentials property to the newly created CredentialCache object. If you are using Windows Integrated Security between the web server and the web service, you set the Credentials property of the web service proxy class to System.Net.CredentialCache. DefaultCredentials. The web server running your webpage will then pass credentials to the web service.

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1 . What type of file would you use to create an XML web service 2. What is the name of the attribute class you would apply to your web service 3. How can you identify a method as exposed as part of a web service

demonstrates how to create components that mix and match client and server functionality. Sometimes it makes sense to do a task on the client, and sometimes it makes sense to do it on the server. 7 walks you through creating components that allow you to do the work of the component (the client, the server, or a combination of both) wherever it makes sense. 8 introduces ADO.NET. No introduction to ADO.NET would be complete without some discussion of XML, and you ll find that there as well. 9 combines ADO.NET with some of the ASP.NET server controls that allow you to create data grids and tables more easily than you might think possible. In addition, I use an example database to show you how to create a form that allows the user to add, edit, and delete records. Finally, 10 uses the same example database to allow information to be shared using XML Web services. XML Web services are a new way to share functionality across the enterprise or across the world.

1 . You would add a new ASMX file to a website to create an XML web service. 2. You would use the WebServiceAttribute class to mark a class as an XML web

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