C# 4 and .NET 4

system.Transactions ❘ 615
The console application is now changed in that a second student is added by using the same transaction
object tx. Because every AddStudent() method opens a new connection, two connections are associated
with the transaction after the second student is added:
static void TransactionPromotion()
{
var tx = new CommittableTransaction();
Utilities.DisplayTransactionInformation("TX created",
tx.TransactionInformation);
try
{
var s1 = new Student
{
FirstName = "Jörg",
LastName = "Neumann",
Company = "thinktecture"
};
var db = new StudentData();
db.AddStudent(s1, tx);
var s2 = new Student
{
FirstName = "Richard",
LastName = "Blewett",
Company = "thinktecture"
};
db.AddStudent(s2, tx);
Utilities.DisplayTransactionInformation("2nd connection enlisted",
tx.TransactionInformation);
if (Utilities.AbortTx())
{
throw new ApplicationException("transaction abort");
}
tx.Commit();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine();
tx.Rollback();
}
}
Utilities.DisplayTransactionInformation("TX finished",
tx.TransactionInformation);
code snippet TransactionSamples/Program.cs
Running the application now, you can see that with the first student added the distributed identifier is 0, but
with the second student added the transaction was promoted, so a distributed identifier is associated with
the transaction:
TX created
Creation Time: 7:56:24 PM
Status: Active
Local ID: 0d2f5ada-32aa-40eb-b9d7-cc6aa9a2a554:1
Distributed ID: 00000000-0000-0000-0000-0000000000
2nd connection enlisted
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