internal CourseSession_Filter[] SingleCourseSessionFilter(string criteria, CourseSession_Fields field)
 {
     return(new CourseSession_Filter[]
     {
         new CourseSession_Filter()
         {
             Field = field,
             Criteria = criteria
         }
     });
 }
 internal CourseSession_Filter[] ExtendCourseSessionFilter(CourseSession_Filter[] filter, string criteria, CourseSession_Fields field)
 {
     return(filter.Concat(SingleCourseSessionFilter(criteria, field)).ToArray());
 }