dotnet下ADO 操作 SQLServer 事务处理

 private static readonly string strCon = "server=.;database=test;uid=sa;pwd=123";
    SqlConnection con = new SqlConnection(strCon);
    public string aaa()
    ...{
        con.Open();
        SqlTransaction sta = con.BeginTransaction(IsolationLevel.ReadCommitted, "aaa");
        SqlCommand cmd = con.CreateCommand();
        cmd.Connection = con;
        cmd.Transaction = sta;

        try
        ...{
            
            cmd.CommandText = "insert into t1 (tAction) values ('a3')";
            cmd.ExecuteNonQuery();
            cmd.CommandText = "insert into t1 (tAction) values ('a4')";
            cmd.ExecuteNonQuery();
            sta.Commit();
            return "success";
        }
        catch (Exception e)
        ...{
            try
            ...{
                sta.Rollback();
            }
            catch (SqlException ex)
            ...{
                if (sta.Connection != null)
                ...{
                    return "An exception of type " + ex.GetType().ToString();
                }
            }
            return e.GetType().ToString();
        }
        finally
        ...{
            con.Close();
        }
    }