Crystal Reports Not Refreshing

Hello Every one

I am getting data from table and showing it thru Crystal Reports.
I have a form in VB based on the list selected from List Box the the table gets filled.
I empty the table before inserting new data.
when I call Action=1 I get old records.
I have to close it and open it again.

Suppose I change the Items in the list I emtpy the table andI fill the the table with new Items
,but I have to close n open it again.
I am using Cystal Reports 4.6

Somebody Please help me.Its urgent