C#开启事务处理

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在C#中开启事务的步骤
01.调用SqlConnection对象的BeginTransaction()方法，创建一个SqlTransaction对象，标志事务开始。
02.将创建的SqlTransaction对象分配给要执行的SqlCommand的Transaction属性。
03.调用相应的方法执行SqlCommand命令。
04.调用SqlTransaction的Commit()方法完成事务。或调用Rollback()方法终止事务。 
例子
           //准备连接字符串
            string str = "data source=.;initial catalog=Myschool;uid=sa;pwd=123";
            //创建数据库连接对象
            SqlConnection con = new SqlConnection(str);
            //sql语句：添加一条记录到年级表
            string sql = "insert into grade values(@gradename)";
            //创建SqlParameter对象，设置参数
            SqlParameter sp = new SqlParameter("@gradename", txtgradename.Text);
            //创建命令对象
             SqlCommand cmd = new SqlCommand(sql, con);
             //通过Parameter集合的add（）方法天填充参数集合
             cmd.Parameters.Add(sp);
            //打开连接
             con.Open();
            //默认让SqlTransaction对象为空
             SqlTransaction trans = null;
            //开启事务：标志事务的开始
             trans = con.BeginTransaction();
            try
            {
                //将创建的SqlTransaction对象分配给要执行的sqlCommand的Transaction属性
                cmd.Transaction = trans;
                //执行sql如果添加成功放回1
                int count=cmd.ExecuteNonQuery();
                if (count > 0)
                {
                    MessageBox.Show("成功");
                    //事务提交
                    trans.Commit();
                }
                else 
                {
                    MessageBox.Show("失败");
                    //事务回滚
                    trans.Rollback();
                }
            }
            catch (Exception)
            {
                //如果某个环节出现问题，则将整个事务回滚
                trans.Rollback();
            }
///循环事务代码 
public static bool SqlTransSqlStr(List<string> SQLStringList, ref string ErrorMsg)    
        {
            bool i = false;
            string connectionString = ConfigurationManager.ConnectionStrings["demo"].ConnectionString;
            using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 connection.Open();
                 SqlCommand cmd = new SqlCommand();
                 cmd.Connection = connection;
                 SqlTransaction tx = connection.BeginTransaction();
                 cmd.Transaction = tx;
                 try
                 {
                     for (int n = 0; n < SQLStringList.Count; n++)
                     {
                         string strsql = SQLStringList[n].ToString();
                       if (strsql.Trim().Length > 1)
                         {
                             cmd.CommandText = strsql;
                             cmd.ExecuteNonQuery();                            
                             cmd.Parameters.Clear();
                         }
                     }
                     tx.Commit();                     i = true;
                }
                 catch (System.Data.SqlClient.SqlException E)
                 {
                     tx.Rollback();
                     ErrorMsg = E.Message;
                     i = false;
                 }
             }
             return i;
         }
//下面的具体代码为个人实际项目测试成功
 SqlConnection con = DB.lianjie();
            con.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = con;
            SqlTransaction tx = con.BeginTransaction();
            cmd.Transaction = tx;
            try
            {
                for (int i = 1; i < dt.Rows.Count; i++)
                {
                    DateTime a1 = Convert.ToDateTime(dt.Rows[i][1]);
                    DateTime a2 = Convert.ToDateTime(dt.Rows[i][2]);
                    DateTime a3 = Convert.ToDateTime(dt.Rows[i][3]);
                    DateTime a4 = Convert.ToDateTime(dt.Rows[i][4]);
                    DateTime a5 = Convert.ToDateTime(dt.Rows[i][10]);
                    DateTime a6 = Convert.ToDateTime(dt.Rows[i][11]);
                    string sqlstr = "insert into xuhao(shebeirukudata,shebeichukudata,SIMrukudata,SIMchukudata,shebeileixing,shebeiSN,SIMkahao,zhanghu,changshang,jiaofeiri,daoqiri,rukujia,chukujia,beizhu,flagkehu,flagguangbu)values('" + a1 + "','" + a2 + "','" + a3 + "','" + a4 + "','" + dt.Rows[i][5] + "','" + dt.Rows[i][6] + "','" + dt.Rows[i][7] + "','" + dt.Rows[i][8] + "','" + dt.Rows[i][9] + "','" + a5 + "','" + a6 + "','" + dt.Rows[i][12] + "','" + dt.Rows[i][13] + "','" + dt.Rows[i][14] + "',0,0)";
                    //插入的insert语句??c1?c2?c3?是数据在数据库中的列名?table1是表名
                    cmd.CommandText = sqlstr;
                    cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                }
                tx.Commit();
                int cc = dt.Rows.Count - 1;
                MessageBox.Show("您成功添加了'" + cc + "'条数据");
                textBox2.Text = Convert.ToString(cc);
            }
            catch
            {
                tx.Rollback();
                MessageBox.Show("出错");
            }