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As any programmer will tell you, you re never going to write code that doesn t fall over at some point whether it s caused by an error within the code or something outside the scope of the code (such as someone unplugging the database server). Unless you have some way of handling any errors that occur, any problems you encounter can have the side effect of leaving connections to the database open. As you ve already learned, database connections are a finite resource, so leaving connections open is definitely not a good idea. If you re using SqlDataSource objects to connect to the database, as in 3, you don t need to worry about error handling to close the database connections. The SqlDataSource handles all the connections to the database internally, so you can be sure that any open database connections are handled before any error is thrown. However, when you re interacting with the database in code, you do need to catch and handle errors.

To check out a working copy you use the command svn checkout. There s only one required argument: a URL that indicates what directory in the repository you re checking out. Other than that, the most interesting options are an optional path, which specifies the name of the directory you want to check out into, with the default being the name of the directory in the repository, and the -r or --revision argument, which allows you to indicate what revision you want to check out. If you don t indicate what revision you want, the HEAD revision of the repository will be used. (Note that this may change in the future to default to the peg revision, then HEAD if a peg revision is not specified. Peg revisions will be explained later in the Working with Branches and Tags section.) Let s take a look at an example of checking out the most recent version of a directory in the repository and inspecting the resulting working copy: $ svn checkout file:///path/to/repository/trunk myproject

You should already be familiar with the try..catch..finally syntax for handling errors, so you ll now see how to use this syntax to handle any errors that may occur within a page. If an error occurs, you ll write the error to a log file and close the open database connection. 1. Open Select.aspx from the root of the 04 Web site and switch to the Source view of the page. 2. Add the following Import statement to the top of the page after the existing Import statements: <%@ Import Namespace="System.IO" %> 3. Change the Page_Load event as follows (the changed lines of code are shown in bold, and note that the name of the table is deliberately incorrect, with an s at the end): protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack == false) { // create the connection SqlConnection myConnection = new SqlConnection(); try { // configure the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; myConnection.ConnectionString = strConnectionString;

<TextView android:text="serif:" android:layout_marginRight="4px" android:textSize="20sp" /> <TextView android:id="@+id/serif" android:text="Hello, world!" android:typeface="serif" android:textSize="20sp" /> </TableRow> <TableRow> <TextView android:text="monospace:" android:layout_marginRight="4px" android:textSize="20sp" /> <TextView android:id="@+id/monospace" android:text="Hello, world!" android:typeface="monospace" android:textSize="20sp" /> </TableRow> <TableRow> <TextView android:text="Custom:" android:layout_marginRight="4px" android:textSize="20sp" /> <TextView android:id="@+id/custom" android:text="Hello, world!" android:textSize="20sp" /> </TableRow> </TableLayout>

// create the command string strCommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturers ORDER BY ManufacturerName"; SqlCommand myCommand = new SqlCommand(strCommandText, myConnection); // open the database connection myConnection.Open(); // show the data DropDownList1.DataSource = myCommand.ExecuteReader(); DropDownList1.DataTextField = "ManufacturerName"; DropDownList1.DataValueField = "ManufacturerID"; DropDownList1.DataBind(); // force the first data bind DropDownList1_SelectedIndexChanged(null, null); } catch (Exception ex) { // write the error to file StreamWriter sw = File.AppendText(Server.MapPath("~/error.log")); sw.WriteLine(ex.Message); sw.Close(); // now rethrow the error throw (ex); } finally { // close the database connection myConnection.Close(); } } } 4. Execute the page. You should immediately be presented with the error shown in Figure 4-9. 5. In Windows Explorer, navigate to the C:\BAND\04 folder, and you ll see that a file called error.log has been created. Open that file. You ll see the error has been logged, as shown in Figure 4-10.

$ ls myproject/

This layout builds a table showing short samples of the four fonts. Notice how the first three have the android:typeface attribute, whose value is one of the three built-in font faces (e.g., "sans").

Figure 4-10. The error has been logged in the error.log file. 6. Switch back to the Source view of the page and fix the intentional error by changing the query to be executed within Page_Load as follows: // create the command string strCommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer ORDER BY ManufacturerName";

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