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The final aspect of the DataTable you should be aware of is the process of updating an existing row with new values. One approach is to first obtain the row(s) that match a given filter criterion using the Select() method. Once you obtain the DataRow(s) in question, modify them accordingly. For example, assume you have a new Button on your form named btnChangeMakes that (when clicked) searches the DataTable for all rows where Make is equal to BMW. Once you identify these items, you change the Make from BMW to Yugo: // Find the rows you want to edit with a filter. private void btnChangeMakes_Click(object sender, EventArgs e) { // Confirm selection. if (DialogResult.Yes == MessageBox.Show("Are you sure BMWs are much nicer than Yugos!", "Please Confirm!", MessageBoxButtons.YesNo)) { // Build a filter. string filterStr = "Make='BMW'"; string strMake = string.Empty; // Find all rows matching the filter. DataRow[] makes = inventoryTable.Select(filterStr); // Change all Beemers to Yugos! for (int i = 0; i < makes.Length; i++) { makes[i]["Make"] = "Yugo"; } } }

If you have an account on http://drupal.org, you can see the effects of providing categories of user information by logging in and clicking the My account link, and then selecting the Edit tab. In addition to editing your account information, such as your password, you can provide information about yourself in several other categories such as Drupal involvement, personal information, work information, and preferences for receiving newsletters.

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; }

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.

Sometimes, you may not want to use Drupal s local users table. For example, maybe you already have a table of users in another database or in LDAP. Drupal makes it easy to integrate external authentication into the login process. Let s implement a very simple external authentication module to illustrate how external authentication works. Suppose your company hires only people named Dave, and usernames are assigned based on first and last names. This module authenticates anyone whose username begins with the string dave, so the users davebrown, davesmith, and davejones will all successfully log in. Our approach will be to use form_alter() to alter the user login validation handler so that it runs our own validation handler. Here is sites/all/modules/custom/authdave/authdave.info: name = Authenticate Daves description = External authentication for all Daves. package = Pro Drupal Development core = 7.x files[] = authdave.module And here is the actual authdave.module: < php /** * Implements hook_form_alter(). * We replace the local login validation handler with our own. */ function authdave_form_alter(&$form, &$form_state, $form_id) { // In this simple example we authenticate on username to see whether starts with dave if ($form_id == 'user_login' || $form_id == 'user_login_block') { $form['#validate'][] = 'authdave_user_form_validate'; } } /** * Custom form validation function */ function authdave_user_form_validate($form, &$form_state) { if (!authdave_authenticate($form_state)) { form_set_error('name', t('Unrecognized username.')); } } /** * Custom user authentication function */ function authdave_authenticate($form_state) {