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Figure 16-7 demonstrates the result. This technique is particularly useful with a database. You could embed a unique ID into the value property and be able to quickly look up a corresponding record depending on the user s selection by examining the value of the SelectedItem object.

Figure 16-7. Binding to the key and value properties Note that for this to work, you can t regenerate the list after every postback. If you do, the selected item information will be lost and an error will occur. The preceding example handles this by checking the Page.IsPostBack property. If it s false (which indicates that the page is being requested for the first time), the page builds the list. When the page is rendered, the current list of items is stored in view state. When the page is posted back, the list of items already exists and doesn t need to be re-created.

def index @actors_today = [] @actors_tomorrow = [] Actor.find(:all).each do |actor| @actors_today << {:actor=>actor, :bookings=>actor.booking.find(:all, :conditions=>[ 'TO_DAYS(booked_at)=' << TO_DAYS(NOW())'])} @actors_tomorrow << {:actor=>actor, :bookings=>actor.booking.find(:all, :conditions=>[ 'TO_DAYS(booked_at)=' << TO_DAYS(NOW())+1'])} end end

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So far, the examples in this chapter have dealt with data binding that doesn t involve databases or any part of ADO.NET. Although this is an easy way to familiarize yourself with the concepts, and a useful approach in its own right, you get the greatest advantage of data binding when you use it in conjunction with a database. When you re using data binding with the information drawn from a database, the data binding process takes place in the same three steps. First you create your data source, which will be a DataReader or DataSet object. A DataReader generally offers the best performance, but it limits your data binding to a single control because it is a forward-only reader. As it fills a control, it traverses the results from beginning to end. Once it s finished, it can t go back to the beginning; so it can t be used in another data binding operation. For this reason, a DataSet is a more common choice. The next example creates a DataSet and binds it to a list. In this example, the DataSet is filled by hand, but it could just as easily be filled using a DataAdapter object, as you saw in the previous chapter.

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To fill a DataSet by hand, you need to follow several steps: 1. First, create the DataSet. 2. Next, create a new DataTable, and add it to the DataSet.Tables collection. 3. Next, define the structure of the table by adding DataColumn objects (one for each field) to the DataTable.Colums collection. 4. Finally, supply the data. You can get a new, blank row that has the same structure as your DataTable by calling the DataTable.NewRow() method. You must then set the data in all its fields, and add the DataRow to the DataTable.Rows collection. Here s how the code unfolds: // Define a DataSet with a single DataTable. DataSet dsInternal = new DataSet(); dsInternal.Tables.Add("Users"); // Define two columns for this table. dsInternal.Tables["Users"].Columns.Add("Name"); dsInternal.Tables["Users"].Columns.Add("Country"); // Add some actual information into the table. DataRow rowNew = dsInternal.Tables["Users"].NewRow(); rowNew["Name"] = "John"; rowNew["Country"] = "Uganda"; dsInternal.Tables["Users"].Rows.Add(rowNew); rowNew = dsInternal.Tables["Users"].NewRow(); rowNew["Name"] = "Samantha"; rowNew["Country"] = "Belgium"; dsInternal.Tables["Users"].Rows.Add(rowNew); rowNew = dsInternal.Tables["Users"].NewRow(); rowNew["Name"] = "Rico"; rowNew["Country"] = "Japan"; dsInternal.Tables["Users"].Rows.Add(rowNew); Next, you bind the DataTable from the DataSet to the appropriate control. Because list controls can only show a single column at a time, you also need to choose the field you want to display for each item by setting the DataTextField property: // Define the binding. lstUser.DataSource = dsInternal.Tables["Users"]; lstUser.DataTextField = "Name"; Alternatively, you could use the entire DataSet for the data source, instead of just the appropriate table. In that case, you would have to select a table by setting the control s DataMember property. This is an equivalent approach, but the code is slightly different:

// Define the binding. lstUser.DataSource = dsInternal; lstUser.DataMember = "Users"; lstUser.DataTextField = "Name"; As always, the last step is to activate the binding: this.DataBind(); The final result is a list with the information from the specified database field, as shown in Figure 16-8. The list box will have an entry for every single record in the table, even if it appears more than once, from the first row to the last.

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