Crystal Report Refreshing

I am using crystal 8.5 with VB front end.
i am using VB GUI for devlopment not
crystal. ADO recordsets are retriving data
for the reports. then retrived data is added
to report using following syntax
Set fld = m_Report.Section3.AddFieldObject
("{ado." & valarr(0) & "}", 400, 0)
i am using Crystal Report Viewer to
view/execute report
Now Problem is,
when report is run for first time it
produces expected results but if its re-
runned/re-executed new data overlaps older
data.
in short, i want report to refresh and
delete old data when new execution takes
place.
Any input will be deeply appreciated

-Rohan :)