/////ado.net1.0中使用Transacation（事务)

string connectionString = "database=Northwind;pwd=admin;uid=sa;server=DATABASE-VPC\\SQL2005";

using (SqlConnection conn = new SqlConnection(connectionString))

{

    conn.Open();

    SqlTransaction transaction = conn.BeginTransaction();

    try

    {

        using (SqlCommand cmd = new SqlCommand())

        {

            cmd.Connection = conn;

            cmd.CommandType = CommandType.Text;

            cmd.CommandText = "";

            cmd.Transaction = transaction;

            cmd.ExecuteNonQuery();

            transaction.Commit();//提交事务

        }

    }

    catch

    {

        transaction.Rollback();//事务回滚

    }

}

/////2.0中使用事务

string connectionString = "database=Northwind;pwd=admin;uid=sa;server=DATABASE-VPC\\SQL2005";

string connectionStringTwo = "database=Test;pwd=admin;uid=sa;server=DATABASE-VPC\\SQL2005";

using (TransactionScope transaction = new TransactionScope())//使用事务

{

    try

    {

        using (SqlConnection conn = new SqlConnection(connectionString))

        {

            using (SqlCommand cmd = new SqlCommand())

            {

                cmd.CommandText = "insert into [member] (name) values (‘test‘)";

                cmd.CommandType = CommandType.Text;

                cmd.Connection = conn;

                conn.Open();

                cmd.ExecuteNonQuery();

            }

        }

        using (SqlConnection conn = new SqlConnection(connectionStringTwo))

        {

            using (SqlCommand cmd = new SqlCommand())

            {

                cmd.CommandText = "insert into [member] (name) values (‘test‘)";

                cmd.CommandType = CommandType.Text;

                cmd.Connection = conn;

                conn.Open();

                cmd.ExecuteNonQuery();

            }

        }

        transaction.Complete();//就这句就可以了。

    }

    catch (Exception ex) { MessageBox.Show(ex.Message); }

}

/*ado.net1.0与ado.net2.0中对比

1.0中不能跨数据库，速度慢

2.0中可以跨数据库，2.0中不再使用com+，速度比1.0快50%（因为它不用把大量的时间消耗在查找在com+中)

2.0中的事务会自动判断使用何种事务（不用您考虑是简单事务还是分部式事务）。

2.0中的Transactions新添加了命名空间。没有com+注册和com+的开销。

*/