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using (TransactionScope objTransScope = new TransactionScope()) { // any database interaction here is transactional // must commit the transaction objTransScope.Complete(); } Any code that executes against a database connection within the using statement is automatically enlisted in the transaction. If an error occurs and the Complete() method isn t called, the transaction will be rolled back automatically. You don t always need to use the using statement to control what is enlisted in the transaction. You can also use a normal try..catch..finally statement to handle the transaction: TransactionScope objTransScope = new TransactionScope() try { // any database interaction here is transactional // must commit the transaction objTransScope.Complete(); } finally { objTransScope.Dispose(); } This is equivalent to the preceding code. Any errors in the try block will cause the Complete() method to be skipped and the transaction to be rolled back when the Dispose() method is called.

Note Currently, only SQL Server 2005 is designed to be used with the System.Transactions namespace. Neither Microsoft Access nor MySQL 5.0, at the time of printing, can be used in conjunction with the System.Transactions namespace. Microsoft Access will throw an error if you try it, and MySQL 5.0 will simply ignore the transaction scope and execute each query individually. With these databases, you re stuck with using the OleDbTransaction and OdbcTransaction objects to enforce transactions across the same Connection object. But in the future, you can expect the namespace to be used in a lot more cases. For more details about using System.Transactions, see http://msdn.microsoft.com/en-us/ library/0abf6ykb.aspx.

@Override protected boolean onTap(int i) { Toast.makeText(NooYawk.this, items.get(i).getSnippet(), Toast.LENGTH_SHORT).show(); return(true); }

As Figure 7-1 shows, the first thing you see when using ViewVC to examine a repository is its directory view. From this view, you can move forward and backward to see the state of this directory at any given revision, navigate to subdirectories by clicking their names, and view the history of a given file by clicking its filename, as shown in Figure 7-2.

Although the System.Transactions namespace is designed to support distributed transactions, not every transaction that it handles is distributed. A transaction under System. Transactions starts its life under the Lightweight Transaction Manager (LTM) and, if the transaction is not distributed, will remain under the control of the LTM. If the transaction needs to

Here, we just toss up a short Toast with the snippet from the OverlayItem, returning true to indicate we handled the tap.

be distributed, it must be under the control of the Distributed Transaction Coordinator (DTC), and using this adds an overhead to the transaction. Thankfully, .NET 2.0 manages the transaction for you. It decides when a transaction needs to be under the control of the DTC and promotes the transaction from being a local transaction to a full-blown distributed transaction. So when does a transaction require the DTC to control it For our purposes, this occurs whenever you use a second Connection object. When a connection is first used within the TransactionScope, it is initially under the control of the LTM. Since it s using only one connection, there is no need to add the overhead of making the transaction distributed. If no other connections are used, then all the queries will be executed under the control of the LTM; the DTC is never used. As soon as a different Connection object tries to enlist in the transaction, it is promoted to being a distributed transaction under the control of the DTC. However this requires that you have the Distributed Transaction Coordinator service running; otherwise, the transaction cannot be promoted and an error will be generated. We ll now look at both of these scenarios: local and distributed transactions.

Figure 7-2. ViewVC viewing a file To view the contents of a file, you can either go to the log history page and click the Download link or, from the directory view, you can click the revision number to view the log message from that revision and the file contents on one screen. Figure 7-3 shows an example.

In order for a transaction to be under the control of the LTM, you need to use the same connection for all queries within the transaction. In this example, you ll modify the DELETE Player page from 8 to use the System.Transactions namespace and implement a local transaction. 1. Open the Administrative Tools folder of Control Panel and open the Services application. Find the Distributed Transaction Coordinator in the list of services. If it is running, stop it (either from the context menu or from the toolbar). 2. Open the 12 Web site in Visual Web Developer and a reference to System.Transactions to the Web site. 3. Copy Players_Delete.aspx from the original folder in the code download to the root of the Web site. 4. Open Players_Delete.aspx in the root of the Web site and add the correct Import statement to the top of the page: <%@ Import Namespace="System.Transactions" %> 5. Replace the SubmitButton_Click event handler with the following (there is an intentional error in the second DELETE query): protected void SubmitButton_Click(object sender, EventArgs e) { // create the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(strConnectionString);