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To use a transaction in a web service, you first have to add a reference to the SystemEnterpriseServices assembly To do this in Visual Studio, right-click References in the Solution Explorer, select Add Reference, and choose SystemEnterpriseServices You should then import the corresponding namespace so that the types you need (TransactionOption and ContextUtil) are at your fingertips: Imports SystemEnterpriseServices To start a transaction in a web service method, set the TransactionOption property of the WebMethod attribute TransactionOption is an enumeration that provides several values that allow you to specify whether a code component uses or requires transactions Because web services must be the root of a transaction, most of these options don t apply To create a web service method that starts a transaction automatically, use the following attribute: <WebMethod(TransactionOption:=TransactionOptionRequiresNew)> _ Public Function TransactionMethod() As DataSet ...

Figure 30-20. Blend s default styles When you select one of these simple styles, a few things happen. First, the control is declared with the {DynamicResource} markup extension. For example, if you place a Simple Button Style on your designer, you ll find XAML similar to: <Button Margin="116,49,220,0" Style="{DynamicResource SimpleButton}" VerticalAlignment="Top" Height="63" Content="Button"/> Strangely enough, the control will look identical to a normal Button. However, if you take a look in your Project window, you will see Blend has added a new file named Simple Styles.xaml (Figure 30-21).

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End Function The transaction is automatically committed when the web method completes The transaction is rolled back if any unhandled exception occurs or if you explicitly instruct the transaction to fail using the following code: ContextUtilSetAbort() Most databases support COM+ transactions The moment you use these databases in a transactional web method, they will automatically be enlisted in the current transaction If the transaction is rolled back, the operations you perform with these databases (such as adding, modifying, or removing records) will be automatically reversed However, some operations (such as writing a file to disk) aren t inherently transactional This means these operations will not be rolled back if the transaction fails Now consider the following web method, which takes two actions It deletes records in a database and then tries to read from a file.

CHAPTER 7 FLEX (THE VIEW LAYER)

Figure 30-21. This is a resource dictionary! If you double-click on this item and open the XAML editor, you will see it is a very large <ResourceDictionary> of default control styles. Furthermore, if you open the Blend Resources window, you ll see each item is listed and can be edited by clicking a given entry (Figure 30-22).

However, if the file operation fails and the exception isn t handled, the entire transaction will be rolled back, and the deleted records will be restored Here s the transactional code: <WebMethod(TransactionOption:=TransactionOptionRequiresNew)> _ Public Sub UpdateDatabase() ' Create ADONET objects Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand("DELETE * FROM Employees", con) ' Apply the update This will be registered as part of the transaction Try conOpen() cmdExecuteNonQuery() Finally conClose() End Try ' Try to access a file This generates an exception that isn't handled ' The web method will be aborted and the changes will be rolled back Dim fs As New FileStream("does_not_existbin", IOFileModeOpen) ' (If no errors have occurred, the database changes ' are committed here when the method ends) End Sub.

Figure 30-22. Selecting a default style for editing If you click on the SimpleButton icon in the Resources view, a new designer will open that you can use to change the style to your heart s content using Blend s standard editing tools (the Properties window, animation editor, etc). Consider Figure 30-23

Another way to handle this code is to catch the error, perform any cleanup that s required, and then explicitly roll back the transaction, if necessary: <WebMethod(TransactionOption:=TransactionOption.RequiresNew)> _ Public Sub UpdateDatabase() ' Create ADO.NET objects. Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand("DELETE * FROM Employees", con) ' Apply the update. Try con.Open() cmd.ExecuteNonQuery() Dim fs As New FileStream("does_not_exist.bin", IO.FileMode.Open) Catch ContextUtil.SetAbort() Finally con.Close() End Try End Sub Does a web service need to use COM+ transactions It all depends on the situation. If multiple updates are required in separate data stores, you may need to use transactions to ensure your data s integrity. If, on the other hand, you re modifying values only in a single database (such as SQL Server 2000), you can probably use the data provider s built-in transaction features instead, as described in 7.

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