代码是关于两个dataSet 分别从不同的数据源取数据，然后进行merge 后，更新其中一个数据源

cn.Open();
                SqlCommand cmd = new SqlCommand(sqlAllCustomers, cn);
                SqlDataAdapter adpt = new SqlDataAdapter(cmd);
               

                // Add
                DataSet dsCust1 = new DataSet();
                DataSet dsCust2 = new DataSet();
                DataSet dsTest = new DataSet();
                //adpt.AcceptChangesDuringFill = false;
                
                adpt.Fill(dsCust1, "TABLE1");
                //adpt.AcceptChangesDuringFill = true;
                using (SqlConnection cnTemp = new SqlConnection(cnStrTemp))
                {
                    //SqlConnection cnTemp = new SqlConnection(cnStrTemp);
                    cnTemp.Open();
                    SqlCommand cmdTemp = new SqlCommand(sqlAllCustomers, cnTemp);
                    SqlDataAdapter adptTemp = new SqlDataAdapter(cmdTemp);
                    adptTemp.AcceptChangesDuringFill = false;
                    adptTemp.Fill(dsCust2, "TABLE1");
                }

                //adpt.Update(dsCust1, "TABLE1");
                dsCust1.Merge(dsCust2);
                
                //111
                SqlCommandBuilder objBuilder = new SqlCommandBuilder(adpt);
                
                
                adpt.UpdateCommand = objBuilder.GetUpdateCommand();
                adpt.InsertCommand = objBuilder.GetInsertCommand();
                adpt.DeleteCommand = objBuilder.GetDeleteCommand();

                DataTable updTable = dsCust1.Tables[0];
                adpt.Update(updTable.Select(null,null, DataViewRowState.Added));

其中主要是，对被合并的数据DataAdapter 属性设置为不稳定，更新的时候将取的数据改为add状态才能更新。否则DataSet 虽然merge 了其它的DataSet 表面上虽然数据已经改变了，但是其状态仍然为稳定状态，更新将失败。