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The data access layer de nes how your application works with data This layer includes the database It includes queries de ned as structured query language (SQL) statements, views, or stored procedures And it includes a data access component that calls these queries to retrieve data or save changes to the data The data access component (DAC) contains the code required to access the database It includes the code that connects to the database, prepares query parameters, calls queries, and returns the results This code is somewhat complex, but it can be written in a generalized fashion so that one set of code can be used to query any table in the database This means that all of your business object classes can call one common DAC to retrieve data from the database and then store any data changes back to the database This keeps all of the data access code encapsulated in one component You can build your DAC to use a vendor-speci c data provider, such as Microsoft SQL Server or Oracle Or you can use a more general data provider, such as ODBC or the newer OleDb, to access databases such as Microsoft Access and MySQL Or you can use the new DbProviderFactory to build a data access component that can access any of these This section provides the steps for building a DAC component that you an use in any application that needs to access a database It also describes how to call the DAC from the business objects. EAN128 Creator In .NET Using Barcode encoder for .NET .Related: Generate Intelligent Mail .NET vb.net barcode scanner tutorial VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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Do, or do not; there is no try Yoda the Jedi Master, The Empire Strikes Back Most applications need to do data They need somewhere to store all the information for products, customers, purchases, samples, contacts, members, and so on They also need to retrieve that information for use in the application, and apply changes to that information All of this is handled in the application s data access layer The data access layer can access data from any source, such as a con guration le, other external le, or database Because the majority of applications use some type of database, this chapter focuses on building a data access layer to access a relational database When you build a data access layer to access a database, the data access layer includes the database to store the data It includes the queries to retrieve the data from the database and save changes back to the database And, it includes the data access component that calls the queries and provides the interaction between the database and your business objects This chapter describes how to build a database, write queries, and create a database project using the tools within Visual Studio It covers how to use Visual Studio to manage connection strings Finally, it details how to build a data access component for accessing the database from your pplication. UPC Case Code In .NET Framework Using Barcode encoder for .NET .Related: It s much preferable to add InteractiveObjects to the display list in the orrect order and use the automatic tab ordering than to have to design your own, but it s sometimes necessary. Text Fields. Encode barcode for .net use visual studio .net barcode encoder touse bar .Related: I: Secrets of the Internet Portals in .NET Encoder Code 3 . 39 in java using java todraw barcode 39 on . & Chat Directory (www.aol.com/community/ directory.html). .Related: In Visual Basic .NET Using Barcode encoder for .NET Control to generate, create barcode image in .The actual property values are speci ed in a composite le, typically as part of the component de nition When a component instance is created, the runtime it is hosted on will set all properties con gured for it For LoanComponent in Listing 18, the runtime will set the currency to a string speci ed in the composite, such as USD or EUR Properties assist with reuse but, more importantly, they allow certain decisions to be deferred from development to deployment A typical case is components that must be con gured differently in development, testing, staging, and production environments: For example, a component that is on gured to connect to a database differently as it moves from development, testing, staging, and nally into production.Related: true false in .NET Display gs1 datamatrix barcode in . 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You begin to build a partial Company wizard in the next section, to see the basics of how a persistent component can be useful; then you complete the wizard in 23 to see how you d deploy it as a complete solution.Related: However, the Web server controls use the runat=server attribute, which is similar to the HTML server controls. ou can also programmatically add a control at run time. The following .Label control You use the Label control to display static text n a Web Forms page that users cannot edit. When you add a Label control, the text "Label" appears as its caption. However, you can use the Text property to modify the caption. Table 3-2 lists some of the properties of the Label control. 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How to Install Data Matrix Barcode Encoder into ASP.NET Projects. .Related: Barcode Generating Word how to, Barcode Generation VB.NET , Print Barcode Excel Library For the entity classes that can be sent across different tiers and for the classes that are used to access the database, it is a good practice to use separate assemblies By doing so, it is easy to define a clear dependency of the assemblies: The entity classes will be needed in multiple tiers and so referenced from many projects, whereas the database classes just need to be referenced from some serviced component assemblies In he sample, you will find the entity classes in the assembly SamplesCourse-. all classes with direct access to the database. Royal Mail Barcode Encoder In Visual Studio .NET Using .Related: capability to Microsoft Internet Information Server (IIS) to display a dynamic URL; . 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