>>No mistake. .Net loads data in datasets in memory, which create major problems. For small desktop apps may be this is suiatble for come components also, but for datacentric applications....
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>What are the major prolems?

Overloaded network, Insuficient memory, In Invoice screen we have a grid with 3 combos - Product Group, Product, Brand. - its management is extremely hard compared with VFP grid, etc.
.Net is not done for desktop applications, it is perfect for web-applications.
My advice is if you will move to web based solution - .Net is your choise otherwise stick with VFP