private void saveEntries()
        {
            if (etNumbOfLesson.Text.Equals("") || etRoom.Text.Equals(""))
            {
                Toast.MakeText(context, "Fill in all the fields", ToastLength.Long).Show();
                return;
            }

            if (DataBaseHelper.ContainsEntry(userGroupID, Int32.Parse(etNumbOfLesson.Text), date))
            {
                Toast.MakeText(context, "Entry with this lesson number already exists", ToastLength.Long).Show();
                return;
            }

            SparseBooleanArray sbArray = lvEntry.CheckedItemPositions;
            int         i        = 0;
            CultureInfo provider = CultureInfo.InvariantCulture;

            foreach (Entry entry in entries)
            {
                entry.EntryDate      = DateTime.Parse(tvDate.Text);
                entry.NumberOfLesson = Int32.Parse(etNumbOfLesson.Text);
                entry.Room           = Int32.Parse(etRoom.Text);
                entry.Professor      = professors.ElementAt(spProfessor.SelectedItemPosition);
                entry.Subject        = subjects.ElementAt(spSubject.SelectedItemPosition);
                if (sbArray.Get(i))
                {
                    entry.Mark = 1;
                }
                DataBaseHelper.AddNewEntry(entry);
                i++;
                //System.Diagnostics.Debug.WriteLine(entry.Student.Name + " " + entry.Mark);
            }

            Toast.MakeText(context, "New entry saved successfully", ToastLength.Long).Show();
            FragmentManager.BeginTransaction()
            .Replace(Resource.Id.content_frame, new LeaderDayFragment())
            .Commit();
        }