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In this example, you ll mimic the results from the Try it Out: Iterating through a DataReader section in the previous chapter and print the details of a single Manufacturer in your sample database. Rather than use a single Web control to present the results, you ll use two Label controls and two HyperLink controls to echo the results. 1. In Visual Web Developer, create a new Web site at C:\BAND\06 and delete the auto-generated Default.aspx file. 2. Add a new Web.config file to the Web site and add a new setting to the <connectionStrings /> element: <add name="SqlConnectionString" connectionString="Data Source=localhost\BAND;Initial Catalog=BAND; Persist Security Info=True;User ID=band;Password=letmein" providerName="System.Data.SqlClient" /> 3. Add a new Web Form called Inline_DataReader.aspx to the Web site. 4. In the Source view, find the <title> tag within the HTML at the bottom of the page and change the page title to Inline Binding to a DataReader. 5. In the Design view, add two Label controls to the page. Name the first lblName and the second lblCountry. Now add two HyperLink controls onto the page. Name them lnkEmail and lnkWebsite. Finally, add one more Label called lblError to house any error messages should something untoward happen (oh, the horror!). Now clear the Text properties for all five Web controls. With a bit of added text (Country, Email, and Website), your page should look something Figure 6-1.

K unmergable.bin The K status means that the file is locked. If someone else attempts to commit changes to this file, they will not be able to and will receive a message that the file is locked. The user who locked the file can unlock it by committing or by an explicit svn unlock command: $ svn unlock unmergable.bin

Figure 6-1. Basic layout for Inline_DataReader.aspx 6. In the Source view, make sure you ve included the correct data provider at the top of the page. <%@ Page Language="C#" %> <%@ Import Namespace="System.Data.SqlClient" %>

As you know, Android devices, by and large, are phones. As such, some activities are more important that others taking a call is probably more important to users than playing Sudoku. And, since it is a phone, it probably has less RAM than your current desktop or notebook possesses. As a result of the device s limited RAM, your activity may find itself being killed off because other activities are going on and the system needs your activity s memory. Think of it as the Android equivalent of the circle of life: Your activity dies so others may live, and so on. You cannot assume that your activity will run until you think it is complete, or even until the user thinks it is complete. This is one example perhaps the most important example of how an activity s life cycle will affect your own application logic. This chapter covers the various states and callbacks that make up an activity s life cycle, and how you can hook into them appropriately.

System.Data.Odbc is the .NET data provider for ODBC-based databases. System.Data.OleDb is the .NET data provider for OLE DB-based databases, such as Microsoft Access. You can also use it to access flat files. System.Data.OracleClient is the .NET data provider for Oracle databases. System.Data.SqlClient is the .NET data provider for SQL Server. System.Data.SqlServerCe is the .NET Compact Framework data provider for SQL Server CE. As you may imagine, its use is limited to applications running on personal digital assistants (PDAs) hosting an instance of SQL Server CE. And that s one of the beauties of ADO.NET. As long as you know which data provider to use, you need to learn only one set of calls, and every data provider supports that set. Figure 14 shows this diagrammatically. Going one step further, if a vendor would rather have .NET developers use a data provider specifically designed for its database server, instead of the generic OLE DB or ODBC one, all the vendor needs to do is implement the same common set of objects that every other data provider includes. An extra method or property here and there may take advantage of a particular feature unique to the data-access technology being modeled by the data provider, but in general, all the objects have the same methods and properties.