>Hi all,
>
>I have a question about multi-tier development.
>
>I am using MSDE and SQL Server for Database and I use primary keys, master-details constraints, and cluster-indexes to maintain data integrity.
>
>According to multi-tier theory, all logic should be in middle tier so that one can change the front end or port it without any difficulty.
>
>If we take famous Tasmanian Traders as example, how we can develop it in a 3-tier structure? I mean what parts would be in the middle tier? Will we use a class file to create our invoice form although this class will not be used in any other form, why not develop it without class, what are the advantages and disadvantages of this approach? Kindly explain.
>
>Regards,

you can read article "N-tier - target any database and any user interface " http://www.utmag.com/September2002/Page10.asp