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Assembly Language: Step-by-Step - part 8

Tham khảo tài liệu 'assembly language: step-by-step - part 8', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | HAPTER Data Access with ADO.NET Previous chapters covered many of the basic elements of Visual Studio .NET the .NET Framework ASP.NET Web Forms and controls. These chapters were intended to provide enough of a .NET foundation to get to the core of most applications data access. Data access is an important factor in most ASP.NET applications. The .NET Framework includes ADO.NET which provides access to data in many locations. ADO.NET is not just another version of ADO it represents a complete paradigm shift in data retrieval and manipulation. ADO.NET is a set of classes to work with data. ADO.NET supports unstructured structured hierarchical and relational data storage which allows access to data wherever it is. It has a consistent object model so learning how to retrieve and manipulate data in one data source is similar to working with most other data sources. Many companies have already embraced XML in some form. Being able to integrate XML data was a primary design constraint of ADO.NET. Integration between ADO.NET and XML is done at with many levels with ADO.NET being able to use many of the XML classes that are built into the .NET Framework. This allows for seamless use of ADO.NET to read and write XML data. 289 290 Chapter 8 This chapter starts by comparing connected and disconnected data and then covers the primary ADO.NET objects looking at many details and examples. After covering the objects this chapter covers different methods of performing data manipulation sorting and filtering using the DataGrid control. Classroom Q A Q Is it possible to load and save data as XML using ADO.NET A Absolutely. ADO.NET represents a major change to ADO ADO.NET is much more XML-centric than past versions of ADO. Q I heard that ADO.NET is focused on disconnected data. Is there a way to get connected data A Yes. ADO.NET is indeed focused around disconnected data but ADO.NET has limited support for connected data via a read-only forward-only result set. This will be covered in