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If you are not new to programming, you probably have, over time, written a fair amount of code. Even if you are relatively new to programming, you might have inherited code that you need to maintain and change. The legacy of time is such that we inherit many components and application frameworks that we need to maintain. Some code becomes redundant as new features are incorporated directly into the programming language, whereas other code is so specific to a particular need that it goes through much iteration and upgrade to improve performance and add additional capability.
If your main development platform is Microsoft, it is also likely that many of the components are in the form of DLLs or COM components. If these applications need access to a database of some sort, it is more than likely that you have a fair bit of code using ADO.
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