Thanks David for your help. RE: If Field is assigned then that is the field which just changed so you can check if Field is one of the fields which should modify the price and if so call your routine for recalculating the price.
There are 24 fields for each orderdetail record. 23 of these have an effect either on the square foot price or the total for the record. Of course the square foot price has an effect on the total since the square foot price is multiplied by the quantity and the square feet of the box. To this is added the upcharges for various options to arrive at the total for the box. 12 of the 24 fields are always used for each box. Am I right in understanding that the TDataSource.OnDataChange will fire each time there is an edit to each of these 24 fields? By edit I'm thinking of a change in the existing value in the control, deleting the value in the control, adding a value to the control. If any of these things occur in one of the 23 fields this could effect either the square foot price or the record total. I'm not quite sure what 'If Field is Assigned' really means. There are two fields that are used to set values for all boxes for the orders. The InfoPower dbLookupCombo (which I use for these) has a OnCloseUp which I use for those two fields. But these values can be overridden by corresponding fields for a record. Again I use the InfoPower dbLookupCombo and it's OnCloseUp event to call the 'calculate' price method. It appears I wouldn't have to do that if I use the TDataSource.OnDataChange event. Appreciate your help, David. Thanks to all. Charlie
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