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option of selecting what type of media is shown by default. In the previous example, the picker will display the user s music library. Following in table 12.1 are the constants you can use to change which library is shown. After you ve created your MPMediaPickerController, you need to create a delegate to respond to two methods: mediaPicker:didPickMediaItems: and mediaPickerDidCancel:.

Linking Tables and Views The link between the DataTable object and the DataView object is typically established at creation time through the constructor, as shown here: public DataView(DataTable table); However, you could also create a new view and associate it with a table at a later time using the DataView object's Table property, as in the following example: DataView dv = new DataView(); dvTable = dataSetTables["Employees"]; You can also obtain a DataView object from any table In fact, the DefaultView property of a DataTable object simply returns a DataView object initialized to work on that table, as shown here: DataView dv = dtDefaultView; Originally, the view is unfiltered, and the index array contains as many elements as there are rows in the table Getting Views of Rows The contents of a DataView object can be scrolled through a variety of programming interfaces, including collections, lists, and enumerators.

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Clearly, these controls serve a variety of uses. Many exist for pure user interface purposes, which we covered pretty extensively in chapter 6. What s of more interest here are the text-input controls (UISearchBar, UITextField, and UITextView) that you re likely to use in conjunction with files and databases. We ll look particularly at UISearchBar and UITextView, the two text inputs that we hadn t previously given much attention to, over the course of this chapter. Not included in this table are the integrated controller pickers that allow users to input data and make choices using complex prebuilt systems. We ll discuss these pickers in later chapters. Controls are central to any real-life program, so you ll see them throughout the upcoming chapters. Because you ll be seeing lots of examples of their use, we can now move on to the next method of user data input: preferences.

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Name: CSUDAs Location: C:\ Solution Name: UDAs When you're done entering the information, confirm that it is correct. 3. At this point, you'll be requested to specify a database reference. Create a new database reference to the tempdb database in the SQL Server instance you're working with, and choose it. The database reference you choose tells Visual Studio where to deploy the UDAs that you develop. After confirming the choice of database reference, a question box will pop up asking you whether you want to enable SQL/CLR debugging on this connection. Choose No. The sample UDAs you'll build in this chapter are quite simple, and there won't be a need for debugging. In the Solution Explorer window, right-click the CSUDAs project, select the menu items Add and Aggregate, and then choose the Aggregate template. Rename the class Aggregate1.cs to CSUDAs_Classes.cs, and confirm. Examine the code of the template. You'll find that a UDA is implemented as a structure (struct in C#, Structure in Visual Basic .NET). It can be implemented as a class as well. The first block of code in the template includes namespaces that are used in the assembly (lines of code starting with "using"). Add three more statements to include the following namespaces: System.Text, System.IO, and System.Runtime.InteropServices. (You can copy those from Listing 6-8.) You are going to use the StringBuilder class from the System.Text namespace, the BinaryReader and BinaryWriter classes from the System.IO namespace, and finally the StructLayout attribute from the System.Runtime.InteropServices namespace (in the second UDA).

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