How can I pass a null DataTime variable

How can I pass a null datetime?
Exampl
http://localhost/LUSReportService/RenderPDF.aspx?ReportName=MeetingNoticeMemorandum&RequestedBy=LISSHOC&Legislature=79&Session=R&CalendarDate=6/10/2005%2012:00:00%20AM&CalendarTime=Leave the parameter off
http://localhost/LUSReportService/RenderPDF.aspx?ReportName=MeetingNoticeMemorandum&RequestedBy=LISSHOC&Legislature=79&Session=R&CalendarDate=6/10/2005%2012:00:00%20AM
"Hugo" wrote:
> How can I pass a null datetime?
> Example
> http://localhost/LUSReportService/RenderPDF.aspx?ReportName=MeetingNoticeMemorandum&RequestedBy=LISSHOC&Legislature=79&Session=R&CalendarDate=6/10/2005%2012:00:00%20AM&CalendarTime=
>sql