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The onRequestComplete function that you used earlier has an obvious problem: It doesn t check for errors. It assumes that the request always succeeds and that the response always contains the expected data. Loss of network connectivity, an overloaded server, and runtime exceptions are a few of the reasons an error can occur. Too many things are not under your control and can have a negative impact on the outcome of a request. In such cases, you need to inform the user properly that an error occurred, or at least have logic in place to manage the error efficiently. Errors fall into two categories: server-returned HTTP errors and non-HTTP errors. You can have a server-returned HTTP error when the request successfully reaches the server but fails to process it. A valid example is when an ASP.NET application throws an exception during the processing of the request, such as attempting to access an object with no reference. When this happens, you can obtain the exact error from the HTTP status code returned by the server. The response s payload also contains the error description. Table 5.1 summarizes the status codes you re interested in.

1. 2.

The resulting generated_metadata.dll assembly must be referenced by the client. The sample client also registers the CAO and acquires two references to (different) remote objects. It then sets the value of those objects and outputs them again, which shows that you really are dealing with two different objects. As you can see in Listing 3-5, the activation of the remote object is done with the new operator. This is possible because you registered the Type as ActivatedClientType before. The runtime now knows that whenever your application creates an instance of this class, it instead should create a reference to a remote object running on the server. Listing 3-5. The Client Accesses the Client-Activated Object using using using using using using System; System.Runtime.Remoting; System.Runtime.Remoting.Channels.Http; System.Runtime.Remoting.Channels; System.Runtime.Remoting.Activation; Server;

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When this string is executed in the browser, the control that appears as the first argument of the __doPostBack method will receive the postback notification on the server and the second argument will be passed as the postback arguments. The clientside JavaScript method named DisplayDialog that is launched when the user clicks the button is shown in listing 8.9.

binding_1.set_dataContext(checkBoxBoolean); binding_1.set_dataPath('checked'); binding_1.set_property('text'); binding_1.set_transformerArgument("Checkbox is {0}."); binding_1.set_direction(Web.BindingDirection.InOut); binding_1.transform.add(Web.Binding.Transformers.ToString); This is the same as how you set it up in the Atlas Script earlier, pointing the binding at the checkBoxBoolean control s checked property. This is then bound to the text property of this control. Note that the binding hasn t yet been associated with the text box, but this will happen shortly. The transformer argument is set up to create the text that will show in the text box after the binding occurs, as well as the direction type for the binding. The values for the binding direction are available in the Web.BindingDirection enumeration. Additionally, the transform Web.Binding.Transformers.ToString is applied. Other values for the transform are available in the Web.Binding.Transformers enumeration. To associate this binding with the text box, you need to call the get_bindings() method to get the collection of bindings associated with this control and call its add method, passing it this binding. You do that like this: textBox.get_bindings().add(binding_1); Another binding connects the checkboxes to each other. Again, this is a Web.Binding control, which supports methods that allow you to set the data context, data path, transform, and property to which to bind. You set it up like this: var binding_2 = new Web.Binding(); binding_2.set_dataContext(checkBoxBoolean); binding_2.set_dataPath('checked'); binding_2.set_property('checked'); binding_2.transform.add(Web.Binding.Transformers.Invert); checkBoxDisabled.get_bindings().add(binding_2); It is vitally important to then call the initialize() method on the controls after all the binding is set up to make sure it works correctly. Sometimes by habit you may initialize them directly after construction, but in this case you should wait until all of the bindings have been configured first: g_checkBoxBoolean.initialize(); g_checkBoxDisabled.initialize(); g_textBox.initialize();

Fully qualified names can be quite long, and using them throughout your code can become quite cumbersome. There are two compiler directives, however, that allow you to avoid having to use fully qualified names the using namespace directive and the using alias directive. Two important points about the using directives are the following: They must be placed at the top of the source file, before any type declarations. They apply for all the namespaces in the current source file.

' ----- Build the connection string. ' !!! WARNING: Hardcoded for now. connectionString = "Data Source=MYSYSTEM\SQLEXPRESS;" & _ "Initial Catalog=Library;Integrated Security=true"

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