How to perform CRUD operation on ASP.NET Core Schedule?

<ej-schedule id="Schedule1" width="100%" height="525px" current-date="new DateTime(2014, 12, 5)">

    <e-appointment-settings apply-time-offset="false" id="Id" subject='"Subject"' start-time='"StartTime"' end-time='"EndTime"' all-day='"AllDay"' recurrence='"Recurrence"' recurrence-rule='"RecurrenceRule"'>

        <e-datamanager url="Home/GetData" crud-url="Home/Batch" adaptor="UrlAdaptor"></e-datamanager>

    </e-appointment-settings>

</ej-schedule>

public List<DefaultSchedule> GetData()

        {

            List<DefaultSchedule> datas = _context.DefaultSchedule.Take(500).ToList();

            return datas;

        }

        public List<DefaultSchedule> Batch([FromBody] EditParams param)

        {

            if (param.action == "insert" || (param.action == "batch" && (param.added.Count>0))) // this block of code will execute while inserting the appointments

            {

                DefaultSchedule appoint = new DefaultSchedule();

                object result;

                if (param.action == "insert")

                {

                    var value = param.value;

                    foreach (var fieldName in value.GetType().GetProperties())

                    {

                        var newName = fieldName.ToString().Split(null);

                        if (newName[1] == "Id") result = (_context.DefaultSchedule.ToList().Count > 0 ? _context.DefaultSchedule.ToList().Max(p => p.Id) : 1) + 1;

                        else if (newName[1] == "StartTime" || newName[1] == "EndTime") result = Convert.ToDateTime(fieldName.GetValue(value));

                        else result = fieldName.GetValue(value);

                        fieldName.SetValue(appoint, result);

                    }

                    _context.DefaultSchedule.Add(appoint);

                }

                else

                {

                    foreach (var item in param.added.Select((x, i) => new { Value = x, Index = i }))

                    {

                        var value = item.Value;

                        foreach (var fieldName in value.GetType().GetProperties())

                        {

                            var newName = fieldName.ToString().Split(null);

                            if (newName[1] == "Id") result = (_context.DefaultSchedule.ToList().Count > 0 ? _context.DefaultSchedule.ToList().Max(p => p.Id) : 1) + 1 + item.Index;

                            else if (newName[1] == "StartTime" || newName[1] == "EndTime") result = Convert.ToDateTime(fieldName.GetValue(value));

                            else result = fieldName.GetValue(value);

                            fieldName.SetValue(appoint, result);

                        }

                        _context.DefaultSchedule.Add(appoint);

                    }

                }

                _context.SaveChanges();

            }

            if ((param.action == "remove") || (param.action == "batch" && (param.deleted.Count > 0))) // this block of code will execute while removing the appointment

            {

                if (param.action == "remove")

                {

                    DefaultSchedule app = _context.DefaultSchedule.Where(c => c.Id == Convert.ToInt32(param.key)).FirstOrDefault();

                    if (app != null) _context.DefaultSchedule.Remove(app);

                }

                else

                {

                    foreach (var a in param.deleted)

                    {

                        var app = _context.DefaultSchedule.ToList().Where(c => c.Id == Convert.ToInt32(a.Id)).FirstOrDefault();

                        if (app != null) _context.DefaultSchedule.Remove(app);

                    }

                }

                _context.SaveChanges();

            }

            if (param.action == "update" || (param.action == "batch" && (param.changed.Count > 0))) // this block of code will execute while updating the appointment

            {

                var value = param.action == "update" ? param.value : param.changed[0];

                var filterData = _context.DefaultSchedule.Where(c => c.Id == Convert.ToInt32(value.Id));

                if (filterData.Count() > 0)

                {

                    DefaultSchedule appoint = _context.DefaultSchedule.Single(A => A.Id == Convert.ToInt32(value.Id));

                    appoint.StartTime = Convert.ToDateTime(value.StartTime);

                    appoint.EndTime = Convert.ToDateTime(value.EndTime);

                    appoint.Subject = value.Subject;

                    appoint.Recurrence = value.Recurrence;

                    appoint.AllDay = value.AllDay;

                    appoint.RecurrenceRule = value.RecurrenceRule;

                }

                _context.SaveChanges();

            }

            List<DefaultSchedule> datas = _context.DefaultSchedule.Take(500).ToList();

            return datas;

        }

    }