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child records, this extra traffic becomes noticeable, and you might find it preferable to fall back on the solution based on the two JOIN statements running inside a transac tion. Only a benchmark based on the actual tables and the actual network configura tion can tell which technique is more efficient or scalable.

A final note: the preceding code defines two DataAdapter objects, one for each table, and uses them only to retrieve the database table s schema. Even if the DataTable objects weren t filled using these DataAdapters, you could still pass them to a Com mandBuilder object to generate the usual INSERT, DELETE, and UPDATE statements that you then use to update either table.

Even though a DataTable object can contain up to slightly more than 16 million rows, you shouldn t even try loading more than a few hundred rows in it, for two good rea sons. First, you d move just too much information through the wire; second, the user won t browse all those rows anyway. So you should attempt to reduce the number of records read for example, by refining the WHERE clause of your query. If this remedy isn t possible, you should offer a pagination mechanism that displays results only one page at a time, without reading more rows than strictly needed each time. Implementing a good paging mechanism isn t trivial. For example, you can easily implement a mediocre paging mechanism by passing a starting record and a number of records as arguments to the DataAdapter s Fill method, as in this code snippet:

The .NET Framework provides a class called Random which exposes a number of methods that can be used to obtain random numbers in a variety of ways. The first thing the program must do is create an instance of the Random class:

Read page N into Publishers table. (Each page contains 10 rows.) da.Fill(ds, (n 1) * 10, 10, Publishers )

22:

Step by Step, and then on the toolbar at the top of the window, click the Uninstall button. appears, click Yes.

Syntax DocumentElement DocumentType NameTable Description The root XmlElement object for this document. The XmlDocumentType object containing the DOCTYPE declaration. Returns the XmlNameTable associated with this implementation. This is a list of all the atomized strings used in the doc ument and makes it possible to perform fast string comparisons. A Boolean value that says whether whitespace should be preserved (read/write). The XmlResolver object used to resolve external references. Creates an attribute and returns an XmlAttribute object. It takes optional arguments for prefix and namespace values. Creates a CDATA section and returns an XmlCDataSection object. Creates a comment and returns an XmlComment object. Creates an empty document fragment and returns an XmlDocumentFragment object. Creates a DOCTYPE section and returns an XmlDocumentType object. Creates an element and returns an XmlElement object. It takes optional arguments for prefix and namespace values. Creates an entity reference and returns an XmlEntityReference object.

XmlResolver Create methods CreateAttribute(name)

CreateDocumentType(name, publicId, systemId, internalSubset) CreateElement(name)

This statement creates a new Random instance and sets the variable rand to refer to it. The instance has been seeded with the value 1, so that it will always produce exactly the same sequence of values. The program can now call methods on this reference to get a hold of random numbers from it:

CreateEntityReference(name)

See Also If you need additional help installing or uninstalling the practice les, see Getting Help later in this book.

Part V:

Table 23-2

Main Members of the XmlDocument Class (continued)

int diceSpots; int winner; diceSpots = rand.Next(1, 7); winner = rand.Next(100); // get a value between 1 and 6 // get a value between 0 and 99