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In the preceding example, we simply populated a DataSet with the help of the SqlXmlAdapter class. What if you make changes to the DataSet data and wish to save those changes in the database The SqlXmlAdapter does provide the Update() method that updates the database with any changes to your DataSet. However, you need to do a bit more work than that. While filling the DataSet, you need to specify the XSD schema for the DataTable being created. This schema provides mapping between the DataTable column names and the actual table column names. In our example, we retrieve three columns of the Employee table: EmployeeID, FirstName, and LastName. The schema for this data structure is shown in Listing 10-21. Listing 10-21. Schema Employees.xsd for Our Data < xml version="1.0" encoding="utf-8" > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="Employees"> <xs:complexType> <xs:sequence> <xs:element name="EmployeeID" type="xs:integer"/> <xs:element name="FirstName" type="xs:string"/> <xs:element name="LastName" type="xs:string"/> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> The schema defines a root element called <Employees>, which has three child elements: <EmployeeID>, <FirstName>, and <LastName>. Note that the schema defines the columns as elements and not as attributes. To see the SqlXmlAdapter class in action, you need to develop an application as shown in Figure 10-5.

Note The default Ubuntu themes until Lucid Lynx were branded as Human and were designed to represent the

skin tones of the world s population. This brand was based on the tagline Linux for Human Beings. With Lucid, a new brand called Light was developed. Among other reasons, this name was chosen because Ubuntu is light and represents a break with the bloatware of proprietary operating systems. 2

Figure 10-5. Application for illustrating the Update() method of SqlXmlAdapter The application consists of a DataGridView control that displays all the employees from the Employees table. You can change the data in the DataGridView and click the Update button to save the changes back to the database. The complete code that makes this application work is shown in Listing 10-22. Listing 10-22. Saving Changes Made to a DataSet DataSet ds = new DataSet(); SqlXmlAdapter da; SqlXmlCommand cmd; string strConn = @"Provider=SQLOLEDB;server=.\sqlexpress;database=northwind;integrated security=SSPI"; private void Form1_Load(object sender, EventArgs e) { cmd = new SqlXmlCommand(strConn); cmd.RootTag = "ROOT"; cmd.CommandText = "Employees"; cmd.CommandType = SqlXmlCommandType.XPath; cmd.SchemaPath = Application.StartupPath + @"\employees.xsd"; ds = new DataSet(); da = new SqlXmlAdapter(cmd); da.Fill(ds); dataGridView1.DataSource = ds.Tables[0].DefaultView; }

In this example, you ll again connect to the SQL Server Management Studio Express (SSMSE) Northwind database.

The default theme in Ubuntu is called Ambiance. Radiance is a similar theme, but with a different color palette. Remember that you ll be working with the theme on a daily basis, so it should be practical and not too distracting. Those miniature Close, Minimize, and Maximize buttons might look stylish, but they re useless if they re so small that you can t reliably click them with your mouse; and if your eyes are constantly wandering to a beautiful but overpowering title bar, you won t be concentrating on your work or play. Depending on the theme you select, the Close, Minimize, and Maximize buttons can be in different places in the top bar of each window. Ambiance in particular sets them to the left in the following order (from left to right): Close, Minimize, and Maximize, whereas Clearlooks uses a more traditional, Windows-like positioning and order. In addition to changing the overall theme, you can also modify individual theme components and even download more theme components.

You can alter the five aspects that constitute a GNOME theme: the controls (sometimes known as widgets), color scheme, window borders, icons, and mouse pointer. To make changes to a theme, select it on the Theme tab of the Appearance Preferences dialog box and then click the Customize button. You will see the Customize Theme dialog box, as shown in Figure 9-2.

private void button1_Click(object sender, EventArgs e) { da.Update(ds); } The code in Listing 10-22 shows several interesting things. The SqlXmlCommand, DataSet, and SqlXmlAdapter variables are declared at the form level because we will be using them in more than one place. Notice the code marked in bold. It sets the RootTag property of the SqlXmlCommand property. The AUTO mode of the FOR XML clause doesn t return data along with a root element by default, so this property is used to indicate the name of the root element inside which the rest of the XML data will be wrapped. The CommandType property is set to XPath, indicating that the CommandText property is an XPath expression. This means that this time the CommandText property is not a SELECT query but the XPath expression Employees, which will return various <Employees> elements. The CommandType property of the SqlXmlCommand class is of type SqlXmlCommandType. The possible values of the SqlXmlCommandType enumeration are listed in Table 10-4.