How to assign any column value coming from source to variable in data flow task in ssis

Hi,

I am calculating one column in derived column in DTF and then I want to use that column in variable as I want to use that value in my next data flow task.

Can you please tell me how can I do that?

I tired one method using script component as transformation is DFT.

In that, in readwritevariable, I gave one datetime user variable  MAX_PBPS_EFFECTIVE_DT

and in I/p and O/p, I used that field 'MAX(MEP_EEFF_DT) '

and in edit script, I wrote below script

Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
        '
         Variables.MAXPBPSEFFECTIVEDT = Row.MAXMEPEEFFDT
        '
    End Sub

But when I ran the package it gave me error that no row assign to variable.

Please help me soon. Thanks in advance.

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Vicky