SSRS Print preview Total Sum vs print Total Sum

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ASP.NET

C#5.0

SQL-Server-2008R2

, +

Hi good day,

Iam using SSRS 2008 for reports
iam having wierd situation where print preview 'Sum' is different from print

My custom code is

Public Total_lookup_Sum As Decimal= 0

Public Function Lookup_Sum(ByVal value As Decimal)As Decimal

    Total_lookup_Sum = Total_lookup_Sum + value

 Return value

End Function

and i am returning to with Expression "=code.Total_lookup_Sum"

Please help me out of this
ur advice is very precious to me

Thank You