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The complete picture for ADO.NET is shown in Figure 4-10. (With the exception of DataSet, the names of the other elements shown in the figure are abstractions, since the actual class names are specific to each data provider.)
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Figure 4-10. The complete ADO.NET model
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In our Friends Reunion application, users can enter information about the places they have studied or worked in the past, so that fellow users can contact them. This information is kept in the following tables in the database:
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The TimeLapse table has a Name field, where users can describe what they were doing in that place. For example, if the place were Columbia University, the name of the time lapse could be Systems Engineer, meaning that the user was studying that career at that place for the period of time in question.
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Try It Out: Assign Places For the next addition to the application, you ll build a form to allow users to enter all of this information. You ll need to load any existing places they ve registered, and allow the editing of this list as well as the creation of new records in the TimeLapse table. As you ve probably guessed, you ll be filling a DataSet object with all of the relevant information. 1. Add a new web form to the application, naming it AssignPlaces.aspx. 2. Link the iestyle.css stylesheet file by dropping it onto the form from the Solution Explorer. 3. Change the code-behind page to inherit from the FriendsBase class, and also import the namespace you ll be using: Imports System.Data.SqlClient Public Class AssignPlaces Inherits FriendsBase 4. To set up this form, add a Panel control called pnlExisting, containing a PlaceHolder control with an ID of phPlaces, which will be filled dynamically with a control for each TimeLapse record found, in much the same way that you saw in 3. Also add an HTML table with eight rows and two columns, and the border property set to 0, with text boxes and a combo box for the creation of a new record. Finally, add a button for performing the insert operation. Figure 4-11 shows what the page should look like. Use the ID properties shown inside the control in Figure 4-11 for each control. The Add button s ID should be btnAdd.
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Figure 4-11. The design of the Assign Places form
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5. Create a new style class called BigTextBox in iestyle.css. This will be for descriptions and notes, which are usually longer than can be contained in regular text boxes. This style is just a copy of the TextBox style with a bigger value for width: .BigTextBox { border-right: #c7ccdc 1px solid; border-top: #c7ccdc 1px solid; border-left: #c7ccdc 1px solid; border-bottom: #c7ccdc 1px solid; font-size: 8pt; font-family: Tahoma, Verdana, 'Times New Roman'; width: 350px; } 6. Set CssClass to BigTextBox for txtDescription, cbPlaces, and txtNotes. All of the other text boxes have the SmallTextBox value, and the button has Button. Set the txtNotes text box Multiline property to True.
Note You could use RequiredFieldValidator controls on each of the required fields here, and you could
use a CompareValidator control to ensure that the period is sensible (so that YearIn is forced to be equal to or less than YearOut, for example. In this example, however, we ll focus on only the data-access aspects.
7. Add the following code to the Page_Load() method (it just sets the agenda for the work to come): Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load MyBase.HeaderMessage = "Assign Places" LoadDataSet() InitPlaces() InitForm() End Sub 8. The first method, LoadDataSet(), will load a DataSet with all of the information needed by this page, and it will necessarily be available as a class-level variable. Once you finish loading the data, the other two methods will initialize the user interface. Add the following code block below the Page_Load() method: Dim ds As DataSet Private Sub LoadDataSet() Dim con As New SqlConnection( _ "data source=.;initial catalog=FriendsData;" + _ "user id=apress;pwd=apress")
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