How to pass Date Parameter to SubReport

Hi,

In my VB.NET database, I am recording exam results for a class and print a report using Crystal Reports filtered by term periods.

There can be two or more exams per year.

Problem is that I cannot find a method to pass date range filter to sub report using report viewer

Main report contains the student info selected by StudentID that is passed as a parameter

Sub report contains the exam date and results information.

The exam dates are in tblClassEvent on subreport.

rptViewer.SetParameterValue("theID", m_theID)

DateRange is also passed into text fields

            Dim sTermPeriod As Object

            Dim sTermDays As Object

            sTermPeriod = rptViewer.ReportDefinition.ReportObjects("txtTermPeriod")

            sTermPeriod.Text = m_strTermStart & "   To: " & m_strTermEnd

            sTermDays = rptViewer.ReportDefinition.ReportObjects("txtTermDays")

            sTermDays.Text = m_iPosAtt

Please advise on either improving on this approach or provide an alternative more sensible approach

All help is appreciated.