SSIS sum of column

This should be fairly easy for you SSIS pros.. I'm kind of new to it.. I have a OLE DB Source Editor that runs the code below and puts the result into a table in SQL(another OLD DB Source).. The only thing I have inbetween the two OLE DB Source editors now is a data conversion transformation editor..... I need to add something else in between that checks the sum of all [current_onhand] and if 0 then fail the package.. If sum [current_onhand] <1 then.... I would like to avoid the VB script task thing because I'm not a VB person if at all possible.. I'm using visual studio 2008.. Is there a componite to check the sum of a colum and then fail if certain condition is met? I want to stick this in between the 2 OLE DB Sources..

SELECT item_id, item, current_onhand, next_supply, next_supply_date, col1,
       col2, col3, col4, col5, creation_date, created_by
FROM sfa.z_item_supply

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