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private void writeOrderTo(StringBuffer xml) { xmlappend("<orders>"); for (int i = 0; i < ordersgetOrderCount(); i++) { Order order = ordersgetOrder(i); xmlappend("<order"); xmlappend(" id='"); xmlappend(ordergetOrderId()); xmlappend("'>"); writeProductsTo(xml, order); xmlappend("</order>"); } xmlappend("</orders>");

In most applications that are using membership, there are additional features that would be nice to have on the client The ability to change the logged-in user without causing a postback is one of them Often in business applications, there is a need to have a manager override entries made in a data-entry screen by a user of limited rights The ability to switch user context using the authentication service without causing a postback would provide a nice alternative to the longer process of switching users via the membership controls To demonstrate this, we look at an order-entry screen that provides the ability to add a discount In most cases, you would not want just any employee to do this Therefore, we need a manager override to accomplish this This is where the ability to log in on the client comes into play In this case, we enable a manager to log in to the application, make a change, and then log out, thus resetting the credentials to the user The order-entry screen shown in Figure 911 contains a Discount drop-down, access to which requires a user with manager rights The Enable link next to the drop-down brings up the Login screen shown in Figure 912, which enables a user to log in with manager credentials, enabling the drop-down and enabling the user to discount the order The call to the authentication service is shown in Listing 913 It passes in the username and password provided by the user and attempts to log the user in A successful login validates the user and enables the drop-down One thing that we are not checking for in this case is the role that the newly logged-in user is in This will be the topic of the next section, as we cover more of what the application services provide on the client.

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Imagine a scenario where a VB 6 application needs to invoke a Java application The Java application is exposed as a Web service with one method called getData You are writing the VB application and you are told that the Java method getData returns an integer So you write your VB code to invoke the Web service using SOAP, which we ll cover in the next chapter When you run your application, you can invoke the Web service fine but sometimes you get runtime error 6 overflow! You get this error because a Java Integer is a 32-bit number while a VB 6 integer is a 16-bit number What just happened was a problem due to the mismatch between the service and client type systems To solve this problem, the client and service developer must agree on a common type system Such type system must provide a set of built in types similar to the intrinsic types you get with any development language, like integer and double In addition, the type system must also provide a means for creating your own data types This capability is analogus to creating your own classes or User Defined Types (Structures) in your favorite programming language This is an extremely important requirement for the type system because in most cases applications will want to exchange structured data rather than simple, scalar values For example, your VB NET application might contain a method called SubmitInvoice that looks like this: Public Function SubmitInvoice(ByVal theInvoice As Invoice) As Integer End Function Where the Invoice type is a class that you created As you learned in chapter 1, you can easily expose this as a Web method by adding the WebMethod attribute to it Before a client can invoke this method, it needs to know what exactly this Invoice class looks like What properties does the Invoice have Because the client can be written in any language, it needs a language independent definition of the Invoice class This is why the Web services type system must allow you to extend it by creating your own types In this case, you would define a new type that represents your Invoice class and the Web service clients would read and understand this type definition in order to invoke your Web service.

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