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The Project class itself has a static method called Exists(), which is public so it can be called from UI code: public static bool Exists(Guid id) { ExistsCommand result; result = DataPortal.Execute<ExistsCommand> (new ExistsCommand(id)); return result.Exists; } While this code is somewhat like other factory methods, it is different in one key way. It creates an instance of an ExistsCommand object, and has the data portal execute the object on the application server: result = DataPortal.Execute<ExistsCommand> (new ExistsCommand(id)); Notice how the id parameter value is used to initialize the ExistsCommand object as it is created. The important thing to understand is that the ExistsCommand object is created and initialized on the client, and then the data portal transfers the object to the server where the object s DataPortal_ Execute() method is run.

The RegistryKey.CreateSubKey() method has a new option that allows the passing in of a RegistryOptions enumeration, allowing you to create a volatile registry key. Volatile registry keys are not persisted during reboots, so they are great for storing temporary data in. The following code shows how to create a volatile registry key:

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Many databases are designed to use identity columns, where the database is responsible for assigning primary key values to rows of data as they are inserted. While the Guid approach used in Project is somewhat simpler to implement, Resource illustrates how to work with identity columns. The changes are limited to the Data Access region of the code, and in particular the DataPortal_ Insert() method. Where the updateResource stored procedure simply returns the updated timestamp for the row, addResource also returns the newly created identity value: SELECT Id, LastChanged FROM Resources WHERE Id=SCOPE_IDENTITY() This means DataPortal_Insert() needs to retrieve that value and update the object s _id field: [Transactional(TransactionalTypes.TransactionScope)] protected override void DataPortal_Insert() { using (SqlConnection cn = new SqlConnection(Database.PTrackerConnection)) { cn.Open(); using (SqlCommand cm = cn.CreateCommand()) { cm.CommandType = CommandType.StoredProcedure; cm.CommandText = "addResource"; cm.Parameters.AddWithValue("@id", _id); cm.Parameters.AddWithValue("@lastName", _lastName); cm.Parameters.AddWithValue("@firstName", _firstName); SqlParameter param = new SqlParameter("@newId",SqlDbType.Int); param.Direction = ParameterDirection.Output; cm.Parameters.Add(param);

is not strictly necessary, it is a good thing to do. Without making the constructor private, it is far too easy for a UI developer to forget to use the factory method and to instead use the new keyword to create the object leading to bugs in the UI code. Finally, though it isn t technically a factory method, the Save() method from BusinessBase is overridden to add authorization checking.

It is no surprise that Microsoft has a set of design and development tools to develop Silverlight-based RIAs. One of the noticeable enhancements with Silverlight is that Microsoft created an opportunity for enterprises to bring the developers and artists/designers together to work on Silverlight RIAs independently, but without losing the development integrity. With the set of integrated designers tools, such as Microsoft Expression Studio, and developers tools, such as Microsoft Visual Studio, Microsoft development platform assists in a great way to develop interactive and rich Silverlight RIAs. The following is a quick summary of tools that can be used to develop Silverlight 4 and prior versions (mainly Silverlight 3) RIAs.

If you have more than one email account set up, the iPod touch will use whichever account is set as the default account. (This is set in Settings > Mail, Contacts, Calendars > Default Account at the bottom of the Mail section.) Follow these steps to change the email account you send from: 1. 2. Tap an email s From: field to highlight it. Tap the From: field again to see a list of your accounts in a scroll wheel at the bottom of the screen. Scroll up or down, and then tap a new email account to select it. Tap the Subject field to finish changing the sending email address.

Table 12-1 summarizes the use of constructors and finalizers with structs. Table 12-1. Summary of Constructors and Finalizers

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