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Part VI:

The final markup for the control is a horizontal bar chart such as the one illustrated in Figure 12-4.

value provided by the field pointed to by DataNavigateUrlField. For example, this col umn generates URLs like these:

Each bar is fully represented by an element in the Items collection. In addition, the BarChart control features a few style properties, as Table 12-4 details.

To simplify the code behind Edit, Update, and Delete, the code reads both the Titles and Publishers table in a DataSet object and then stores it in a Session variable. (Of course, all my warnings against storing a DataSet or a DataTable in a Session variable are still valid, but I needed to simplify the code to keep it manageable enough for this demo.)

TABLE 12-4

Actual Vs Quota Europe report. Notice that the Actual Vs Quota report is no longer visible. 27 Click the View tab, click the Full Screen button to expand the view, and then scroll down to view the whole table.

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The style of the whole row that contains the bar The style of the label The style of the subtitle in the control s header The style of the title in the control s header The style of the element displaying the value rendered

The DataSet that contains the data. Dim ds As New DataSet() Private Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) _ Handles MyBase.Load If Not Me.IsPostBack Then If this is the first time the form is displayed, read the DataSet

The attributes of all style properties are applied in the Render method, as in other data-bound controls.

FillDataSet()

The user interface of the BarChart control is created in the overloaded version of CreateChildControls.

BindDataGrid()

protected override int CreateChildControls( IEnumerable dataSource, bool dataBinding) { return CreateControlHierarchy(dataSource, dataBinding); }

Else Or just retrieve the DataSet from the Session variable. ds = DirectCast(Session( DataSet ), DataSet) End If End Sub Fill the DataSet from the Pubs database. Sub FillDataSet() Dim cn As New OleDbConnection(OledbPubsConnString) cn.Open() Fill the Titles DataTable. Dim daTitles As New OleDbDataAdapter( SELECT * FROM Titles", cn) daTitles.Fill(ds, Titles ) Fill the Publishers DataTable (with only the fields you need). Dim daPubs As New OleDbDataAdapter( _ SELECT pub_id,pub_name FROM Publishers", cn) daPubs.Fill(ds, Publishers ) Close the connection. cn.Close() Create the relation between the two tables. ds.Relations.Add( PubsTitles", _ ds.Tables( Publishers ).Columns( pub_id ), _ ds.Tables( Titles ).Columns( pub_id )) End Sub

Both input arguments are passed down to an internal CreateControlHierarchy method, which is ultimately responsible for the creation of the bar chart:

Thanks to the relation between the Titles and the Publishers table, you can display the name of the publisher in each row by using the following data binding expression for the Label control in the third column:

int CreateControlHierarchy(IEnumerable dataSource, bool dataBinding) { // Get the data to display (either from data source or viewstate) if (dataSource == null) { RenderEmptyControl(); return 0; } // Start building the hierarchy of controls Table t = new Table(); Controls.Add(t); // Add the header row with the caption CreateTitle(t); // Add the subtitle row CreateSubTitle(t); // Add bars int totalItems = CreateAllItems(t, dataSource, dataBinding); return totalItems; }

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