How to read data from Project and write them back?

Hi, everyone.

I know how to read data from Project. But I need help to write them back to Project.

Here is my code about reading data form Project

public bool LoadData(ref List<TaskRecord> recordList, string _MSPFileName)
        {
            bool result = false;
            _prjApp = new ApplicationClass();
            _prjApp.FileOpen(_MSPFileName, true, missing, missing, missing, missing,
                missing, missing, missing, missing, missing, PjPoolOpen.pjPoolReadOnly,
                missing, missing, missing, missing);
            var enumer = _prjApp.Projects.GetEnumerator();
            enumer.MoveNext();
            var prj = enumer.Current as Project;
            var taskEumer = prj.Tasks.GetEnumerator();
            while (taskEumer.MoveNext())
            {
                var mspTask = taskEumer.Current as Task;
                if (null == mspTask)
                {
                    continue;
                }
                // TaskRecord class is my class to record the data form Project
                TaskRecord record = new TaskRecord();
                //begin to get the data, some other properties are not listd here.
                record.Guid = mspTask.Guid;
                record.ID = mspTask.UniqueID;
                record.OrderNumber = mspTask.ID;
                record.TaskName = mspTask.Name;
                record.OutlineNumber = mspTask.OutlineNumber;

                recordList.Add(record);
            }
            _prjApp.FileClose(PjSaveType.pjDoNotSave, false);
            _prjApp.Quit(PjSaveType.pjDoNotSave);
            return result;
        }

TaskRecord is a very simple class

public class TaskRecord
    {
        public string Guid { get; set; }
        public int ID { get; set; }
        public int OrderNumber { get; set; }
        public string TaskName { get; set; }
        public string OutlineNumber { get; set; }
    }

I would like to wirte a SaceData() method to write the data back. At leat, I would like to write Guid, UniqueId, Name, OutlineNumber back to project. I would like someone help me to modify my current code. Thanks a lot.