C# SqlTransaction 交易作業 (完成交易或復原異動)

using (SqlConnection conn = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["trdataConnectionString"].ToString()))
{
if (conn.State != ConnectionState.Open) conn.Open();
SqlTransaction tran = conn.BeginTransaction();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandTimeout = 60;
cmd.CommandText = "UPDATE AA SET AA=null WHERE (1=2)";
cmd.Transaction = tran;
int result = cmd.ExecuteNonQuery();
if (result == 0)
{
tran.Rollback(); //交易取消
}
else
{
tran.Commit(); //執行交易
}
conn.Close();
}

***********************************************************************************************

private static void ExecuteSqlTransaction(string connectionString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();

SqlCommand command = connection.CreateCommand();
SqlTransaction transaction;

// Start a local transaction.
transaction = connection.BeginTransaction("SampleTransaction");

// Must assign both transaction object and connection
// to Command object for a pending local transaction
command.Connection = connection;
command.Transaction = transaction;

try
{
command.CommandText =
"Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
command.ExecuteNonQuery();
command.CommandText =
"Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
command.ExecuteNonQuery();

// Attempt to commit the transaction.
transaction.Commit();
Console.WriteLine("Both records are written to database.");
}
catch (Exception ex)
{
Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
Console.WriteLine(" Message: {0}", ex.Message);

// Attempt to roll back the transaction.
try
{
transaction.Rollback();
}
catch (Exception ex2)
{
// This catch block will handle any errors that may have occurred
// on the server that would cause the rollback to fail, such as
// a closed connection.
Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
Console.WriteLine(" Message: {0}", ex2.Message);
}
}
}
}