asp net core barcode scanner

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You ve seen in the previous sections how ASP.NET and ADO.NET can be used to connect to databases and manipulate the data therein through connections, commands, and readers. However, most modern applications require flexible, graphical access to the same data. As a developer, you aren t going to want to develop all of this complex data access and binding code from the ground up. ASP .NET provides controls that give you visual- and designer-based access to data through data binding, but all of them use a DataSource control to provide access to the underlying database. Because we are using SQL Server data in this example, the SQL Server specific DataSource control will be used. You aren t limited to using this control, because .NET provides several others, such as ObjectDataSource and XMLDataSource, but these go beyond the scope of this chapter. Still, the principles that you learn from the SqlDataSource control will apply across all data sources when data binding is taken into context.

You can find many themes available for download at Drupal.org (http://drupal.org/project/ Themes). Installing them is a simple process, but you need to make sure that you have the necessary theme engine installed. This should always be clear from the theme s description on Drupal.org, but is often overlooked. If you do not have the proper theme engine (as determined by taking a peek in your themes/engines directory), locate and download the theme engine first (from http://drupal.org/project/Theme%20engines).

When you are using Visual Studio or Visual Web Developer Express, open the Designer to edit any ASP .NET page. You will see a Data tab on the Toolbox. This tab contains the SqlDataSource control. Drag and drop it onto the design surface, and its Tasks pane will open (see Figure 4-19).

Caution Make sure that the version number of your theme, theme engine, and Drupal installation match.

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This pane contains a Configure Data Source link. Selecting this link will launch the SQL Server Connection wizard (see Figure 4-20). The first step in this wizard is to select a database connection, if one already exists.

After downloading a theme, unpack it and move the unpacked folder to the themes directory. The name of the unpacked directory is the name of the theme. Navigate to administer themes (admin/themes), and you will see the theme listed. Activate the theme, and determine whether it is to be the main theme for the site. If not, you can activate it for your user account from your account page (my account).

Configure your theme by going to administer themes and clicking the Configure tab (admin/themes/settings). See 2 for a complete discussion on how to configure a theme, including setting the primary and secondary links, toggling post information, and so on. Your theme is now installed and configured. To uninstall a theme, deactivate it from administer themes (admin/themes) and remove it from the themes directory.

to build an application that generates dynamic pages. Because Java is a cross-platform language, the platform on which the code ran no longer mattered, and server-side Java, called servlets, became an effective replacement for CGI. But the problem of generating HTML still existed. In these applications, string management, or printf statements, were used to write HTML, leading to ugly and onerous code. In another approach, HTML defined the output, and special extension tags instructed the server to do something when it reached those tags and fill in the placeholders. The code would look like the pseudocode here:

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