public List<StudentVisitSummaryReportItem> GetStudentVisitSummaryReport(DateTime? startTime, DateTime? endTime) { var ds = new ReportRepository(); startTime = (startTime != null) ? startTime : new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1); endTime = (endTime != null) ? endTime : DateTime.Today; return ds.GetStudentVisitSummaryReport(startTime.Value, endTime.Value); }