Chapter 5. Copying and Transferring Data
Introduction
This chapter focuses on copying data between ADO.NET classes and between ADO and ADO.NET classes, serializing and deserializing data, and encrypting data and login credentials to build secure applications.
Copying rows from one DataTable
to another and
copying tables from one DataSet
to another are
operations performed frequently in data-centric applications. Recipe 5.1 and Recipe 5.2 show
different ways to copy data and discuss the advantages, limitations,
and disadvantages of the different approaches.
The DataReader
provides connected forward-only,
read-only access to a data stream while the
DataSet
provides disconnected access to data
stored as an in-memory relational database. There is no built-in
method to convert a DataReader
to a
DataSet
, so Recipe 5.3
shows how it’s done.
In addition, this chapter covers:
- Serializing and deserializing data
Serialization allows data conversion to a format that can be persisted or transported. The .NET framework supports serialization and deserialization with the
System.Runtime.Serialization
namespace. Support for binary, XML, and SOAP formats is built in and serialization can easily be customized if required. Recipe 5.4 and Recipe 5.5 show how to serialize and deserialize data.As well as copying data, ADO.NET supports merging disconnected data in
DataTable
orDataSet
objects into each other. Recipe 5.6 shows how merging works and how to use the arguments that control the merge operation.- Security ...
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