Hi Junjun,
The price of your software is mostly dependant upon the ability of your customers to pay. I would suggest you ask some potential customers what they would be willing to pay for a product such as yours and then go from there.
Hugh
Microsoft hears loudest what the VFP community says about Visual FoxPro by looking at the bottom line!
Support the product. Buy the latest version!
Hugh Winters @ WorldData 408-512-1131