I'm new to SSRS and I'm having trouble understanding how to use this script. Can you please assist?

I've entered the following in the report perameters - code window.

Public Function CalcRatio(ByVal Numerator As Object, ByVal Denominator As object, ByVal DivZeroDefault As Object) As Object

If Denominator <> 0 Then

Return Numerator/Denominator

Else

Return DivZeroDefault

End If

End Function

I then entered the following in the expression of the textbox.

=code.CalcRatio((sum(Fields!total.Value)+(Fields!Adjustment.Value))/Fields!Goal.Value, 0)

but I get the following error.

The Value expression for the textbox ‘textbox28’ contains an error: [BC30455] Argument not specified for parameter 'DivZeroDefault' of 'Public Function CalcRatio(Numerator As Object, Denominator As Object, DivZeroDefault As Object) As Object'.

What am I doing wrong?

Thanks in advance for any help you may be able to provide.

Regards,

Missa