New PDF release: ADO.NET Examples and Best Practices for C# Programmers

By William R. Vaughn

Written in particular for COM-based ADO builders retooling for ADO.NET utilizing the C# language, this e-book brings clean insights and pointers on the ADO.NET know-how. Veteran authors William Vaughn and Peter Blackburn have packed this formative consultant with sensible suggestion on how one can write code that's either speedier working and more uncomplicated to appreciate.

The onset of the hot .NET expertise is forcing builders to fully reconsider their info entry suggestions. This ebook lets you do that via operating examples and diverse discussions of what works and what doesnt. Derived from years of expertise operating with information entry builders, ADO.NET Examples and most sensible Practices for C# Programmers includes a suite of innovations confirmed to greatly lessen overhead, difficulties, and confusionfor the devleoper, the process, and the total crew. whereas a few are very simple to enforce, others require massive forethought to permit. it is a builders bookfull of tricks, information and notes handed on from these whove spent major time within the .NET and C# trenches.

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The DataSet: • Is a memory-resident structure constructed by the DataAdapter Fill method. • Contains zero or more DataTable objects. • Is logically tied to a DataAdapter object used to fetch and perform action queries as needed. 25 Chapter 1 • Contains Constraints and Relations collections to manage inter-DataTable relationships. • Is data-source agnostic, stateless, and can function independently from the data source. All data, schema, constraints, and relationships to other tables in the DataSet are contained therein.

NET Applications As I said before, all "unmanaged" code executed by the CLR must be handled differently from "managed" code. " (The ADO. NET component and the COM-based code thinks that it's communicating to a COM-based host. Figure 1-1 illustrates this extra layer of protection wrapped around all COM components . NET Framework All COM object, property, method, and event references pass through the COM interop layer. Figure 1-1. NET via the COM interop layer. 19 Chapter 1 I suspect we'll see a few side effects caused by this additional translation layer that can't help but hurt performance.

WriteLine() method. To use the Debug object, you must reference the System. Diagnostics namespace by using System. Diagnostics. This is helpful when the intended recipient of an exception message is a developer, but not necessarily so useful for your program to spew it all out to a user while committing hari-karL Fortunately, the Debug object is automatically stripped from release builds. Your user doesn't care much for which line in your code triggered the self-disembowelment-but more on exceptions in Chapter 9.

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