TransactionScope类是framework2.0 新增的一个类，在System.Transactions命名空间中，使用时必须先添加System.Transactions引用；另外还要在windows控制面版-->管理工具-->服务-->Distributed Transaction Coordinator-->属性-->启动，启动这个服务.示例代码如下：

 

try
            {
                using (TransactionScope scope = new TransactionScope())
                {                    //更新northwind数据库的Employees表                    
                    using (SqlConnection conOne = new SqlConnection("server=.;uid=sa;pwd=123;database=northwind"))
                    {
                        conOne.Open();
                        SqlCommand command = new SqlCommand("update Employees set lastname='chen' where employeeid='1'", conOne);
                        int i = command.ExecuteNonQuery();
                    }                    //更新pubs数据库的jobs表                 
                    using (SqlConnection conTwo = new SqlConnection("server=.;uid=sa;pwd=123;database=pubs"))
                    {
                        conTwo.Open();
                        SqlCommand command = new SqlCommand("update jobs set job_desc='chen' where job_id='1'", conTwo);
                        int i = command.ExecuteNonQuery();
                    }
                    scope.Complete();  //提交事物               
                }
            }
            catch (Exception ex)       //发生异常后自动回滚            
            {
                //throw;           
            }