Making my application more updatable

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hi

i was wondering haw to make my application more updatable online, like i
will divide my applivction to datalayer assembly, business rules assembly,
user interface asembly, so if i want then later to update any assembly what
should i make a scrit application hat conpy that dll to some folder ? or haw
can i make an exe update service pack is it a norman VS Project ?

and is it better to divide the business assembly to more assemblies ?
--
Ammar S. Mitoori
IT Head QIMCO Co.
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