//creating method to add data coming from angular project through url
        public async Task <Object> AddFullDetail(DateSheetViewModel dateSheet)
        {
            if (ModelState.IsValid)
            {
                DateSheet model = new DateSheet
                {
                    ID            = dateSheet.ID,
                    Class         = authDb.Classes.Where(a => a.ID == dateSheet.Class).FirstOrDefault(),
                    Subject       = authDb.Courses.Where(a => a.ID == dateSheet.Subject).FirstOrDefault(),
                    Teacher       = authDb.Teachers.Where(a => a.ID == dateSheet.Teacher).FirstOrDefault(),
                    Date          = dateSheet.Date,
                    StartDate     = dateSheet.StartDate,
                    EndDate       = dateSheet.EndDate,
                    DateSheetName = dateSheet.DateSheetHeader,
                };
                if (authDb.DateSheet.Any(a => a.Class == model.Class && a.Date == model.Date))
                {
                    await Task.Run(() => authDb.RemoveRange(authDb.DateSheet.Where(a => a.Class == model.Class && a.Date == model.Date).ToList()));

                    await authDb.SaveChangesAsync();
                }

                await Task.Run(() => authDb.AddAsync(model));

                await authDb.SaveChangesAsync();

                return(Ok("success"));
            }
            return(BadRequest(ModelState));
        }