hassaveddata and DiscardSavedData

Hi to all:

I try to use this code to discard empty values of fields parameters in my report:

Code:

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If (rpt.HasSavedData) Then rpt.DiscardSavedData()

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but VS2008 tell me in the line marked in bold:

"DiscardSavedData its not a member of crystaldecisions....."

Any help please?

Thanks