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CHAPTER 5 DATA BINDING
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Figure 5-12. The DataBindings dialog box 13. Inside the panel, drop a web forms Panel control with BackColor set to Gainsboro and CssClass to PlaceHeader. Position the cursor inside it, remove the default text, and drop an Image control with ImageUrl set to Images/building.gif and ImageAlign to Middle. Next to it, drop a Label control. Click the ellipsis next to (DataBindings) in the Properties browser to open the DataBindings dialog box, and then set the following custom data binding expression: DataBinder.Eval(Container, "DataItem.Name") Finally, below the gray Panel control, drop an ImageButton control and set the following properties for it: AlternateText: Select ImageUrl: Images/bluearrow.gif CommandName: Select ImageAlign: Right The layout of the ItemTemplate section should look like this:
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CHAPTER 5 DATA BINDING
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14. For the AlternatingItemTemplate section, you can simply copy the entire Flow Layout Panel control, including its controls from the previous steps, into this section to reuse the code (they are using essentially the same behavior). Then change its style property to set the background color to lightskyblue, so it looks like this:
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15. Now you need to set up the SelectedItemTemplate, which is a little more complex than the previous templates. To start with, copy the panel you configured for the previous templates. Then change the containing Flow Layout Panel control s style property to define BACKGROUND-COLOR as #5d90c3. Also change the contained web form s Panel control so BackColor is Gray. Next to the existing Label control, drop another one with CssClass set to Hidden, and set ID to lblAdministratorID. Then set the following custom data binding expression: DataBinder.Eval(Container, "DataItem.AdministratorID") This Label control will be used to determine whether the current user can edit the selected row, and set the ImageButton control s Visible property accordingly. The style ensures it won t appear in the display, yet it will be rendered (unlike setting Visible = False) so you can use it. Change the ImageButton control s properties as follows: AlternateText: Edit ImageUrl: Images/edit.gif CommandName: Edit Visible: False ID: cmdEdit Directly above this button, enter a line break (Shift+Enter). Then add three Label controls with text Type:, Address:, and Notes:, respectively, as shown here:
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For the Type label, set the following custom data binding expression: DataBinder.Eval(Container, "DataItem.TypeName")
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CHAPTER 5 DATA BINDING
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For the Address label, set this custom data binding expression: DataBinder.Eval(Container, "DataItem.Address") And for the Notes label, set this custom data binding expression: DataBinder.Eval(Container, "DataItem.Notes") Finally, set COLOR: white for the style property of the containing Flow Layout Panel control, to make the text stand out against the new blue backcolor. 16. Reopen the code-behind page and add the following code, which performs the binding and additionally prevents the DataList from being displayed if there are no places to display: Private Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) If Not Page.IsPostBack Then BindPlaces() End If End Sub Private Sub BindPlaces() adPlaces.Fill(dsPlaces) If dsPlaces.Place.Rows.Count = 0 Then dlPlaces.Visible = False Else dlPlaces.DataBind() End If End Sub 17. In the Design view, end template editing in the DataList control (right-click it and select End Template Editing). Then double-click it to create the handler for the SelectedIndexChanged event, adding the following code to it: Private Sub dlPlaces_SelectedIndexChanged(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles dlPlaces.SelectedIndexChanged BindPlaces() End Sub 18. Save and run the page. Test the selection mechanism, and see how the template is applied to the selected item to show the complete details.
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How It Works For a DataList control, data binding works just as it does with a DataGrid control. At runtime, the template is instantiated, binding expressions are evaluated, and controls are added to the output for each element in the data source. The important controls are the ImageButton controls that you placed at the bottom right of each template. The values that you ve assigned to the CommandName properties of these buttons Select and Edit have special meanings: the DataList uses them to raise the events discussed
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