C# System.EnterpriseServices自动完成事物

using System.EnterpriseServices;

    [Transaction(TransactionOption.Required)]
    public class StudentService : ServicedComponent
    {
        private readonly string connString =
            System.Configuration.ConfigurationManager.ConnectionStrings["conn"].ConnectionString;

        [AutoComplete]
        public void AddStudent()
        {
            System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(connString);
            System.Data.SqlClient.SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = "insert into student(name,age) values(@name,@age)";
            try
            {
                cmd.Parameters.AddWithValue("@name", "张三");
                cmd.Parameters.AddWithValue("@age", "20");
                conn.Open();
                cmd.ExecuteNonQuery();
            }
            finally
            {
                conn.Close();
            }
        }
    }