C# 4 and .NET 4

system.Transactions ❘ 619
it with the connection. Then the Complete() method of the TransactionScope class sets the success bit.
With the end of the using statement, the TransactionScope is disposed, and a commit is done. If the
Complete() method is not invoked, the Dispose() method aborts the transaction.
If an ADO.NET connection should not enlist with an ambient transaction, you can set
the value Enlist=false with the connection string.
static void TransactionScope()
{
using (var scope = new TransactionScope())
{
Transaction.Current.TransactionCompleted +=
OnTransactionCompleted;
Utilities.DisplayTransactionInformation("Ambient TX created",
Transaction.Current.TransactionInformation);
var s1 = new Student
{
FirstName = "Ingo",
LastName = "Rammer",
Company = "thinktecture"
};
var db = new StudentData();
db.AddStudent(s1);
if (!Utilities.AbortTx())
scope.Complete();
else
Console.WriteLine("transaction will be aborted");
}
} // scope.Dispose()
static void OnTransactionCompleted(object sender, TransactionEventArgs e)
{
Utilities.DisplayTransactionInformation("TX completed",
e.Transaction.TransactionInformation);
}
code snippet TransactionSamples/Program.cs
Running the application, you can see an active ambient transaction after an instance of the
TransactionScope class is created. The last output of the application is the output from
the TransactionCompleted event handler to display the fi nished transaction state:
Ambient TX created
Creation Time: 9:55:40 PM
Status: Active
Local ID: a06df6fb-7266-435e-b90e-f024f1d6966e:1
Distributed ID: 00000000-0000-0000-0000-0000000000
Abort the Transaction (y/n) n
TX completed
Creation Time: 9:55:40 PM
Status: Committed
Local ID: a06df6fb-7266-435e-b90e-f024f1d6966e:1
Distributed ID: 00000000-0000-0000-0000-0000000000
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