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In the previous lesson, you learned how to implement partial-page updates by using the UpdatePanel control and other features of the Microsoft ASP.NET AJAX-oriented controls. These controls make it easy to create a client callback (a call to the server followed by a call back to the client from the server). There may be times, however, when you need more control over how you call to the server from the client and vice versa. In these cases, you need to write your own asynchronous client callbacks. Creating a page with its own client callback code follows a standard set of steps. First, you must define the server-side code. To do so:

</Modularity:ModuleInfo> </Modularity:ModuleInfoGroup> <!-- Module info without a group --> <Modularity:ModuleInfo Ref="ModuleD.xap" ModuleName="ModuleD" ModuleType="ModuleD.ModuleD, ModuleD, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" /> </Modularity:ModuleCatalog>

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Any sort of modeling is good, but accompanying models with tests generated from models is powerful. Models help testers understand (and explain) complex systems, they help manage risk, and they help find bugs. Generated test cases from models can do some interesting things, things human testers might not think of or have the patience to do. This unexpected behavior in the model generates unexpected behavior in the application (and this is good for testers). For example, a test of 100 randomly generated steps might or might not (but usually does) find a bug that's deeply buried in the tested application. If you were as thorough as the random walk that generated these 100 steps, you, too, might find the bug, but why trouble yourself when, with the proper instructions, the computer can randomly walk the tested app day and night until it finds a crash Model-based tests, of course, do much more than random walks through an application. Microsoft teams have used model-based tests in conjunction with traditional test automation to test many features and applications effectively. Teams that are successful using modeling also understand that modeling is just one tool of many test tools in a tester's toolbox.

Implement the System.Web.UI.ICallbackEventHandler for your ASP.NET page. This serverside interface is used to set up both the receive call from the client (RaiseCallbackEvent) and the method that returns processing to the client (GetCallbackResults). Implement the RaiseCallbackEvent method for the ICallbackEventHandler interface. This method is called by the client. You can use it to receive parameter values from the client. Implement the GetCallbackResult method for the ICallbackEventHandler interface. This function is used to return the results of any server-side processing. The results are sent as a string back to the client code. After the server-side code is written, the next task is to create the client-side code. This also follows a standard set of steps:

2. 3.

Add a client script function that will be called by the server as the result of the server processing. You can use this function to process any results coming back from the server. This function s name should be the same as the name you registered with the GetCallbackEventReference inside your server-side code when the page is loaded. This ensures that the callback gets called after server-side processing. Create another JavaScript function that calls the server from the client. This function is typically created in your server-side code when the page is loaded. Doing so allows you to register the client-side function by using the RegisterClientScriptBlock method of the ClientScriptManager control. This function is then used by one or more controls on your page to initiate the client-side call to the server. The final JavaScript function that is inserted into the rendered page is actually generated for you by ASP.NET. This is the function that actually does the calling between the client and server. This function is generated when you use the GetCallbackEventReference method of the ClientScriptManager control in your server-side code.

Model-Based Software Testing and Analysis with C# by Jonathan Jacky, Margus Veanes, Colin Campbell, and Wolfram Schulte Practical Model-Based Testing: A Tools Approach by Mark Utting and Bruno Legeard Testing Object Oriented Systems by Robert Binder Spec Explorer, http://research.microsoft.com/projects/specexplorer/ NModel Modeling tool, http://www.codeplex.com/NModel

As an example, suppose you have a webpage that contains a DropDownList control. Imagine that you want to call the server when the user selects an item from the DropDownList, but you do not want to do a full-page post. Rather, you want to initiate an asynchronous client callback. You can then do some processing on the server and return the results to the client. The client page can then be updated without causing a refresh.

Let s see how to implement this example. First, you would need to implement the ICallbackEventHandler interface for the code-behind page. This code might look as follows.

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