Will using factory methods in .NET COM Interop increase performance?

Making calls across interop is always going to be expensive. I don't think the solution that you are describing will improve performance. Best bet would to loop through the recordset in vb6 adding each property to an array e.g. Ary_SKU(), ary_Quantity(), etc. Then once finished pass the arrays as parameters to .

Net and loop through the arrays again on the .net side and build up the classes from the data in the arrays.

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