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A view object is an alternative representation of a table (or set of tables). For example, you can use Microsoft SQL Server to create a view for your Inventory table that returns a new table containing automobiles only of a given color. In ADO.NET, the DataView type allows you to extract a subset of data programmatically from the DataTable into a stand-alone object. One great advantage of holding multiple views of the same table is that you can bind these views to various GUI widgets (such as the DataGridView). For example, one DataGridView might be bound to a DataView showing all autos in the Inventory, while another might be configured to display only green automobiles. To see this in action, update the current UI with an additional DataGridView type named dataGridYugosView and a descriptive Label. Next, define a member variable named yugosOnlyView of type DataView: public partial class MainForm : Form { // View of the DataTable. DataView yugosOnlyView; ... } Now create a new helper function named CreateDataView() and call this method within the form s default constructor immediately after the DataTable has been fully constructed, as shown here: public MainForm() { ... // Make a data table. CreateDataTable(); // Make a view. CreateDataView(); } Here is the implementation of this new helper function. Notice that the constructor of each DataView has been passed the DataTable that you will use to build the custom set of data rows: private void CreateDataView() { // Set the table that is used to construct this view. yugosOnlyView = new DataView(inventoryTable); // Now configure the views using a filter. yugosOnlyView.RowFilter = "Make = 'Yugo'"; // Bind to the new grid. dataGridYugosView.DataSource = yugosOnlyView; }

Digest authentication, like Basic authentication, requires the user to provide account information using a login dialog box that is displayed by the browser. Unlike Basic authentication, however, Digest authentication passes a hash of the password, rather than the password itself. (Digest is another name for hash, which explains the name of this authentication scheme.) Because a hash is used, the password itself is never sent across the network, thereby preventing it from being stolen even if you aren t using SSL.

As you can see, the DataView class supports a property named RowFilter, which contains the string representing the filtering criteria used to extract matching rows. Once you establish your view, set the grid s DataSource property accordingly. Figure 22-10 shows the completed Windows Forms data-binding application in action.

package com.apress.usermanager.service; import java.util.List; import com.apress.usermanager.dao.BaseSpringTestCase; import com.apress.usermanager.model.User; import com.apress.usermanager.service.UserService;

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The process of authenticating a user with Digest authentication works like this: 1 The unauthenticated client requests a restricted web page 2 The server responds with an HTTP 401 response This response includes a nonce value a randomly generated series of bytes The web server ensures that each nonce value is unique before it issues it 3 The client uses the nonce, the password, the user name, and some other values to create a hash This hash value, known as the digest, is sent back to the server along with the plaintext user name 4 The server uses the nonce value, its stored password for the user name, and the other values to create a hash It then compares this hash to the one provided by the client If they match, then the authentication succeeds.

Now that you understand the ins-and-outs of manipulating ADO.NET DataSets manually, it s time to turn your attention to the topic of data adapter objects. A data adapter is a class used to fill a DataSet with DataTable objects; this class can also send modified DataTables back to the database for processing. Table 22-8 documents the core members of the DbDataAdapter base class, the common parent to every data adapter object (e.g., SqlDataAdapter and OdbcDataAdapter).

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