TransactionScope和Enterprise Libray 3.0 Data Access Application Block

/// <summary>
/// Transfers an amount between two accounts.
/// </summary>
/// <param name="transactionAmount">Amount to transfer.</param>
/// <param name="sourceAccount">Account to be credited.</param>
/// <param name="destinationAccount">Account to be debited.</param>
/// <returns>true if sucessful; otherwise false.</returns>
/// <remarks>Demonstrates executing multiple updates within the 
/// context of a transaction.</remarks>
public bool Transfer(int transactionAmount, int sourceAccount, int destinationAccount)
{
bool result = false; 
// Create the Database object, using the default database service. The
// default database service is determined through configuration.
Database db = DatabaseFactory.CreateDatabase();  
// Two operations, one to credit an account, and one to debit another
// account.
string sqlCommand = "CreditAccount"
DbCommand creditCommand = db.GetStoredProcCommand(sqlCommand);  
db.AddInParameter(creditCommand, "AccountID", DbType.Int32, sourceAccount);
db.AddInParameter(creditCommand, "Amount", DbType.Int32, transactionAmount);  
sqlCommand = "DebitAccount"
DbCommand debitCommand = db.GetStoredProcCommand(sqlCommand);  
db.AddInParameter(debitCommand, "AccountID", DbType.Int32, destinationAccount);
db.AddInParameter(debitCommand, "Amount", DbType.Int32, transactionAmount);  
using (DbConnection connection = db.CreateConnection())
{
connection.Open();
DbTransaction transaction = connection.BeginTransaction();  
try
{
// Credit the first account
db.ExecuteNonQuery(creditCommand, transaction);
// Debit the second account
db.ExecuteNonQuery(debitCommand, transaction);  
// Commit the transaction
transaction.Commit();  
result = true;
}
catch
{
// Rollback transaction 
transaction.Rollback();
}
connection.Close();  
return result;
}
}  

public bool Transfer(int transactionAmount, int sourceAccount, int destinationAccount)
{
bool result = false;
Database database = DatabaseFactory.CreateDatabase();  
using (TransactionScope scope = new TransactionScope(TransactionScopeOption.RequiresNew))
{
TestCommand1(database, transactionAmount, sourceAccount);
TestCommand2(database, transactionAmount, destinationAccount);
scope.Complete();
result = true;
}
return result;  
}  
private void TestCommand1(Database db, int transactionAmount, int sourceAccount)
{
string sqlCommand = "CreditAccount"
DbCommand creditCommand = db.GetStoredProcCommand(sqlCommand);  
db.AddInParameter(creditCommand, "AccountID", DbType.Int32, sourceAccount);
db.AddInParameter(creditCommand, "Amount", DbType.Int32, transactionAmount);  
// Credit the first account
db.ExecuteNonQuery(creditCommand);
}  
private void TestCommand2(Database db, int transactionAmount, int destinationAccount)
{
string sqlCommand = "DebitAccount"
DbCommand debitCommand = db.GetStoredProcCommand(sqlCommand);  
db.AddInParameter(debitCommand, "AccountID", DbType.Int32, destinationAccount);
db.AddInParameter(debitCommand, "Amount", DbType.Int32, transactionAmount);  
// Debit the second account
db.ExecuteNonQuery(debitCommand);
}