public AuditTrailFilter()
{
TimestampFilterParameters = new List<AuditTrailDateFilterParameter>();
SummaryFilterParameters = new List<AuditTrailTextFilterParameter>();
SubjectNameFilterParameters = new List<AuditTrailTextFilterParameter>();
UserNameFilterParameters = new List<AuditTrailTextFilterParameter>();
SortParameters = new List<AuditTrailSortParameter>();
}