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Make Code 39 Full ASCII in Font Figure 9-9. The Acudei project s Default page layout

Figure 9-9. The Acudei project s Default page layout
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1. Add text, two TextBox controls, a Button control, and a DataGrid control to the Default.aspx form of the Acudei test application, as shown in Figure 9-9. 2. Set the TextBox ID properties to txtLogin and txtPassword, the button s to btnRefresh, and the DataGrid s to grdContacts. Set the button s Text property to Refresh.
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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3. Double-click the button to get to the Click event handler. Add the following code to it: Private Sub btnRefresh_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnRefresh.Click Dim friends = New Acudei.FriendsService.Partners Dim ds As DataSet = friends.GetContactRequests( _ txtLogin.Text, txtPassword.Text) grdContacts.DataSource = ds grdContacts.DataBind() End Sub 4. Start the application again, and then fill the text boxes with the usual apress login and password. You ll see a page like the one shown in Figure 9-10.
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Figure 9-10. The web service consumer application
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How It Works Just as in the previous example, the proxy class and .NET infrastructure takes care of passing the information to the remote web method and handing results back. In this case, you receive a complex DataSet object back, which can be readily used to fill your DataGrid control. You take advantage of data binding, as discussed in 5. Having both the consumer application and the web service inside the Friends Reunion project makes it extremely easy to follow the execution flow. If you place breakpoints in your web methods code before starting the Acudei consumer site project, you can step into the code easily. Note that we don t handle errors that could happen, such as connectivity problems, service malfunctioning, and so on. We will introduce some error handling that is particular to web services in the Error Handling in Web Services section later in this chapter. General debugging and exception-handling techniques are covered in 11.
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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An Introduction to SOAP
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Although there s no need for us to go deep into the gory details (as .NET takes care of it all for us), it s useful to know where SOAP comes in to all of this, as it plays a fundamental behind-thescenes role in web services. SOAP is a means of sending a message to an endpoint (URL), and it offers an alternative to the HTTP-POST options that we ve already discussed. It is used in .NET as the default method for accessing web services. This is due to the richer functionality that it offers, namely a more structured way of alerting the calling application to errors (which we ll cover shortly), support for return parameters (reference parameters), and other such features.
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Note SOAP originally stood for Simple Object Access Protocol, although we doubt anyone can call it
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simple anymore.
SOAP is not just yet another Remote Procedure Call (RPC) mechanism. It certainly can be used as such, but SOAP is more message-oriented, and it s exclusively based on XML. The SOAP specification consists of the following parts: The message format, required elements, and processing model An optional set of rules for encoding application data and method parameters for performing RPC-style calls between web services SOAP message transmission through HTTP The latter two belong to low-level support from libraries, and they are already handled for you in .NET infrastructure. The first, the message format itself, defines an open structure that allows for easy and structured extensibility, and is worth looking at further, as it s at the core of web services.
Understanding the SOAP Message Format
SOAP uses XML to send information between applications as messages. This usage of XML supports sending the data in a well-structured format. This allows you to provide more robust systems than would be possible if the only way of accessing web services was by passing parameters on a URL imagine trying to pass an entire dataset around using only a query string! When used for request/response message exchange, there will be two types of messages: SOAP request: This is sent to a SOAP-compliant application (such as IIS and ASP .NET) for processing, usually over HTTP This processing can be (and usually is) an invocation . of an application method exposed as a web service. In this case, the request includes information such as the arguments required by the method. SOAP response: This is returned from a SOAP-compliant application and contains the results of processing a SOAP request, if it completed successfully.
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