未将对象引用至实例化

Question

try
            {
                _reworkNumOpreate.Open();
                string sqltext2 = "select rn_numer from reworkNum where rn_Name = '" + reNumEntiInfo.Rn_Name + "' and rn_Model = '" + reNumEntiInfo.Rn_Model + "' and rn_Matril = '" + reNumEntiInfo.Rn_Matril + "' and rn_Process = '" + reNumEntiInfo.Rn_Process + "'";
                object obj = _reworkNumOpreate.RunCommandEx(sqltext2);
                if (obj == null)
                {
                    MessageBox.Show("当前产品已空，此次为第一次录入！");
                    int countt = 0;
                    string sqlText = "insert into reworkNum(rn_Name,rn_Model,rn_Matril,rn_Process,rn_numer) values('" + reNumEntiInfo.Rn_Name + "','" + reNumEntiInfo.Rn_Model + "','" + reNumEntiInfo.Rn_Matril + "','" + reNumEntiInfo.Rn_Process + "'," + reNumEntiInfo.Rn_numer + ")";
                    _reworkNumOpreate.RunCommand(sqlText, out countt);
                    _reworkNumOpreate.CommitTrans();//提交事务

                }
                else
                {
                    int count2 = int.Parse(obj.ToString());
                    int countt = 0;
                    string sqlText = "update reworkNum set rn_numer = " + count2 + "+" + reNumEntiInfo.Rn_numer + " where rn_Name = '" + reNumEntiInfo.Rn_Name + "' and rn_Model = '" + reNumEntiInfo.Rn_Model + "' and rn_Matril = '" + reNumEntiInfo.Rn_Matril + "' and rn_Process = '" + reNumEntiInfo.Rn_Process + "'";
                    _reworkNumOpreate.RunCommand(sqlText, out countt);
                    _reworkNumOpreate.CommitTrans();//提交事务
                }
            }
            catch (SqlException ex)
            {
                _reworkNumOpreate.RollbackTrans();//回滚事务
            }
            _reworkNumOpreate.Close();

 

每次一提交事务 马上就报错！ 真没找到问题啊！请高手赐教

Answer 1

reworkNumOpreate是否实例化，设置断点调试下

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http://blog.csdn.net/zx13525079024

Answer 2

谢谢回答，是我自己失误。我忘了开始事务了！