After an application is deployed, there might be a need for changes in the application.
For example, the application might need substantial architectural changes to improve its
performance. As the performance load on a deployed application server grows, system
resources can become inadequate, resulting in higher response times. As a solution to
these problems, the application might need to undergo architectural changes by adding
tiers. Here, the problem is not the multitier application design, but rather the problem lies
in increasing the number of tiers after an application is deployed. This transformation
becomes easier if the original application is implemented in ADO.NET using datasets. In
ADO.NET, the communication between tiers is relatively easy, because the tiers can
transmit data through XML-formatted datasets.
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