Unrecognized identifier

Hi

  I am getting above error on below expression

=Ceiling(Code.MyFun(Fields!LCode.Value)/5) . In Custom Code below is the code 

Dim FlagTable As System.Collections.Hashtable
Dim Flag AS Integer
Function MyFunc(ByVal NewValue As Object) As Integer
If (FlagTable Is Nothing) Then
FlagTable = New System.Collections.Hashtable
End If
If (NewValue Is Nothing) Then
NewValue = "-"
End If
If (Not FlagTable .Contains(NewValue )) Then
Flag =Flag + 1
FlagTable.Add(NewValue, nothing)
End If
MyFunc = Flag
End Function

Thanks