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Figure 8-1. BalloonShop with a login box After logging in as an administrator, the UserInfo box displays links to the administrative parts of the site. The first page of the catalog administration section that you ll build in this chapter will look like Figure 8-2 (note that it reuses the UserInfo control).

So, the core code for the whole three-stage binding process could be as simple as the following: myConnectionOpen(); myReader = myCommandExecuteReader(); RadioButtonList1DataSource = myReader; RadioButtonList1DataTextField = "ManufacturerName"; RadioButtonList1DataValueField = "ManufacturerID"; RadioButtonList1DataBind(); myReaderClose(); myConnectionClose(); This is true of all four Web list controls Another thing that you ll soon discover is that you can use a DataReader as a Web list control s data source only on a one-to-one basis Unlike inline binding, where you can bind many properties to the same column in a DataReader, you can t bind many Web list controls to the same columns in a DataReader Actually, you can t bind more than one Web list control to the same DataReader.

In this case, ASP.NET will cache separate versions, provided the query string differs by ProductID or CurrencyType.

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The following example uses two web pages to demonstrate how multiple versions of a web page can be cached separately. The first page, QueryStringSender.aspx, isn t cached. It provides three buttons, as shown in Figure 26-4.

Once DataBind() has been called on one of the Web list controls, it works through all the rows in a DataReader, which, of course, is forward-only, so you can t go back to the beginning and bind the same information The only way to bind all three Web controls from the same source is to use something other than a DataReader a DataSet, for example as the data source That said, you ll now look at a common application of data-bound lists: using the selection from a list to look up data from another table First, you ll see how to do this using a DataReader as the source of the list to populate a GridView based on the user s selection from a DropDownList, a RadioButtonList, or a ListBox.

Tip Although the list of departments looks like a DataList control, it s actually a GridView. You ll learn more about this control later, when you create the DepartmentsAdmin Web User Control. For now, it s important to know that it allows for easy integration of edit, select, and delete functionalities. When the Edit, Edit Categories (Select), or Delete buttons are clicked, events are generated that can be handled in code.

A single event handler handles the Click event for all three buttons. The event handler navigates to the QueryStringRecipient.aspx page and adds a Version parameter to the query string to indicate which button was clicked cmdNormal, cmdLarge, or cmdSmall.

Protected Sub cmdNormal_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles cmdNormal.Click, cmdLarge.Click, cmdSmall.Click Response.Redirect("QueryStringRecipient.aspx" & _ " Version=" & CType(sender, Control).ID) End Sub

The QueryStringRecipient.aspx destination page displays the familiar date message. The page uses an OutputCache directive that looks for a single query string parameter (named Version):

You can accomplish the same task using a DataSet instead of a DataReader, but in order to do that, you need to start dealing with events So, first we ll look at the two relevant events, DataBound and SelectedIndexChanged, and then we ll extend the DataReader example before moving on to build the corresponding page using a DataSet..

Figure 8-2. Administering departments The functionality you ll implement for departments is much the same as you ll see for categories and products. More specifically, the administrator can Edit the department s name or description by clicking the Edit button. Edit the categories for a specific department by clicking the Edit Categories button. Completely remove a department from the database by clicking the Delete button (this works only if the department has no related categories; otherwise, the administrator is notified that the operation couldn t be completed). When clicking the Edit button, the grid enters edit mode, and its fields become editable TextBox controls, as shown in Figure 8-3. Also, as you can see, instead of the Edit button, you get Update and Cancel buttons. Clicking Update updates the database with the changes, whereas clicking Cancel simply quits edit mode.

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