fsProductColumn.offStruct     = FIELDOFFSET (PRODUCT_RECORD, pszProductName);
fsGrossIncomeColumn.offStruct = FIELDOFFSET (PRODUCT_RECORD, pszGrossIncome);
fsNetIncomeColumn.offStruct   = FIELDOFFSET (PRODUCT_RECORD, pszNetIncome);
fsTotalCostColumn.offStruct   = FIELDOFFSET (PRODUCT_RECORD, pszTotalCost);
