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DataTables provide a number of methods beyond what we ve examined thus far. For example, like DataSets, DataTables support AcceptChanges(), GetChanges(), Copy(), and ReadXml()/WriteXml() methods. As of .NET 2.0, DataTables also now support a method named CreateDataReader(). This method allows you to obtain the data within a DataTable using a data reader like navigation scheme (forward-only, read-only). To illustrate, create a new helper function named PrintTable(), implemented as so: private static void PrintTable(DataTable dt) { Console.WriteLine("\n***** Rows in DataTable *****"); // Get the new .NET 2.0 DataTableReader type. DataTableReader dtReader = dt.CreateDataReader(); // The DataTableReader works just like the DataReader. while (dtReader.Read()) { for (int i = 0; i < dtReader.FieldCount; i++) { Console.Write("{0} = {1} ", dtReader.GetName(i), dtReader.GetValue(i).ToString().Trim()); } Console.WriteLine(); } dtReader.Close(); } Notice that the DataTableReader works identically to the data reader object of your data provider. Using a DataTableReader can be an ideal choice when you wish to quickly pump out the data within a DataTable without needing to traverse the internal row and column collections. To call this method, simply pass in the correct table: static void Main(string[] args) { ... // Print out the DataTable via 'table reader'. PrintTable(carsInventoryDS.Tables["Inventory"]); }

To wrap up the current example, recall that DataSets and DataTables both support WriteXml() and ReadXml() methods. WriteXml() allows you to persist the object s content to a local file (as well as into any System.IO.Stream-derived type) as an XML document. ReadXml() allows you to hydrate the state of a DataSet (or DataTable) from a given XML document. In addition, DataSets and DataTables both support WriteXmlSchema() and ReadXmlSchema() to save or load an *.xsd file. To test this out for yourself, update your Main() method with the final set of code statements: static void Main(string[] args) { ... // Save this DataSet as XML. carsInventoryDS.WriteXml("carsDataSet.xml"); carsInventoryDS.WriteXmlSchema("carsDataSet.xsd"); // Clear out DataSet and print contents (which are empty). carsInventoryDS.Clear(); PrintDataSet(carsInventoryDS); // Load and print the DataSet. carsInventoryDS.ReadXml("carsDataSet.xml"); PrintDataSet(carsInventoryDS); } If you open the carsDataSet.xml file, you will find that each column in the table has been encoded as an XML element: < xml version="1.0" standalone="yes" > <Car_x0020_Inventory> <Inventory> <CarID>0</CarID> <Make>BMW</Make> <Color>Black</Color> <PetName>Hamlet</PetName> </Inventory> <Inventory> <CarID>1</CarID> <Make>Saab</Make> <Color>Red</Color> <PetName>Sea Breeze</PetName> </Inventory> </Car_x0020_Inventory> Finally, recall that the DataColumn type supports a property named ColumnMapping, which can be used to control how a column should be represented in XML. The default setting is MappingType.Element. However, if you establish the CarID column as an XML attribute as follows by updating your existing carIDColumn DataColumn object static void Main(string[] args) { ... DataColumn carIDColumn = new DataColumn("CarID", typeof(int)); ... carIDColumn.ColumnMapping = MappingType.Attribute; } you will find the following XML:

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< xml version="1.0" standalone="yes" > <Car_x0020_Inventory> <Inventory CarID="0"> <Make>BMW</Make> <Color>Black</Color> <PetName>Hamlet</PetName> </Inventory> <Inventory CarID="1"> <Make>Saab</Make> <Color>Red</Color> <PetName>Sea Breeze</PetName> </Inventory> </Car_x0020_Inventory>

The contents of any input with a value of text in the type attribute The contents of any a with an href value that includes

Listing 4-2. The cEquipment Class Private Private Private Private Private ' m_lngID As Long m_sPCType As String m_sPhoneType As String m_sLocation As String m_sFaxYN As String

Now that you have been exposed to the process of interacting with DataSets in the raw, let s see a Windows Forms example. Your goal is to build a Form that displays the contents of a DataTable within a DataGridView widget. Figure 22-13 shows the initial UI design.

As of .NET 2.0, the DataGridView widget is the preferred UI control used to bind relational data. Do be aware, however, that the legacy .NET 1.x DataGrid control is still available.

To begin, create a new Windows Forms application named CarDataTableViewer. Add a DataGridView widget (named carInventoryGridView) and descriptive Label to your designer. Next, insert a new C# class into your project (named Car), which is defined as follows: public class Car { // Made public for ease of use. public string carPetName, carMake, carColor; public Car(string petName, string make, string color) { carPetName = petName;

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