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Figure 25-1. Sequential DNS lookups The Dns class supports asynchronous methods, meaning that you can perform your queries in parallel, as demonstrated by Listing 25-2. Listing 25-2. Asynchronously Querying the DNS using System; using System.Net; class Listing 02 { static void Main(string[] args) { string[] hostNames = new string[] { "www.microsoft.com", "www.apple.com", "www.google.com", "www.ibm.com" }; for (int i = 0; i < hostNames.Length; i++) { Dns.BeginGetHostEntry(hostNames[i], GetHostEntryCallback, hostNames[i]); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } static void GetHostEntryCallback(IAsyncResult result) { // get the result of the async method call IPHostEntry hostEntry = Dns.EndGetHostEntry(result); // print out the host name Console.WriteLine("Result for {0} is {1}", result.AsyncState, hostEntry.HostName); } } When the main thread calls an asynchronous method, it doesn t have to wait until the method has completed. Asynchronous methods come in pairs, and the names of these methods are the same as the synchronous equivalent, prefixed with Begin and End. So, for the example in Listing 25-2, the asynchronous counterparts to the GetHostEntry are BeginGetHostEntry and EndGetHostEntry. Start by using the Begin method; this method takes the same parameters as the synchronous equivalent, plus a callback method and a state object, as illustrated by Figure 25-2.

The factory methods discussed earlier create instances of a Criteria object Factory methods use a Criteria object to pass the criteria required to load the object through the data portal to the corresponding DataPortal_XYZ method The criteria data for a Project is a Guid value: its primary key in the database The criteria data for a simple object is often a single value though your database may use multipart keys, in which case it would include multiple values Criteria data for collection objects is often more complex, since it typically provides a filter rather than a specific key value The Criteria class itself is private, since it is only used within Project Also, it is a nested class, which allows the data portal to determine that this is criteria for a Project object An alternative would be to have it inherit from Csla.

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1. Select the StackPanel tool from the toolbar. 2. In Row 1 Column 0, draw out a StackPanel. 3. Select the Ellipse tool again from the toolbar. 4. Draw three Ellipses with fixed Heights and Widths and no margins in the newly created

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CriteriaBase, in which case the business object type would be specified in the constructor However, the CriteriaBase option is designed primarily for use by code generation tools, and so the nested class approach is used here: [Serializable()] private class Criteria { private Guid _id; public Guid Id { get { return _id; } } public Criteria(Guid id) { _id = id; } } Notice that the class is marked with the [Serializable()] attribute, so the data portal can transfer the object from the client to the server as needed To make the factory methods easier to implement, this class includes a constructor that accepts the criterion as a parameter That value is stored within the object and is exposed as a read-only property The DataPortal_XYZ methods will make use of this property value to interact with the appropriate data in the database.

With the Criteria class defined, let s move on to discuss the DataPortal_XYZ methods themselves In this sample application, the data access code is relatively straightforward Keep in mind, however, that these routines could be much more complex, interacting with multiple databases, merging data from various sources, and doing whatever is required to retrieve and update data in your business environment..

role At that point, a concurrency issue is detected and an exception is thrown The database transaction handles rolling back the database to a valid state, but all those Role objects now have invalid timestamp values in memory Somehow the Roles object needs to be reset to the state it was in before Save() was called Another issue occurs if the data portal is configured to run locally in the client process In that case, the object is not serialized to a server, but rather is updated in place on the client It is possible that the business object could raise PropertyChanged or ListChanged events while it is being updated, causing the UI to refresh during the data update process Not only does that incur performance costs, but sometimes code in the UI might respond to those events in ways that cause bugs.

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