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You can use data binding with the Hashtable and ArrayList, two of the more useful collection classes in the System.Collections namespace. However, as you learned in 3, .NET includes a more stringent set of collections in another namespace: System.Collections.Generic. These collections are ideal in cases where you want your collection to hold just a single type of object (for example, just strings). When you use the generic collections, you choose the item type you want to use, and the collection object is locked in to your choice (which is similar to how an array works). This means if you try to add another type of object that doesn t belong in the collection, you ll get a compile-time error. Similarly, when you pull an item out of the collection, you don t need to write casting code to convert it to the right type, because the compiler already knows what type of objects you re using. This behavior is safer and more convenient, and it s what you ll want most of the time. To use a generic collection, you must import the right namespace: Imports System.Collections.Generic The generic version of the ArrayList class is named List. Here s how you create a List collection object that can only store strings: Dim fruit As New List(Of String)() fruit.Add("Kiwi") fruit.Add("Pear") The only real difference is that you need to specify the type of data you want to use when you declare the List object.

Sometimes you ll need to set a parameter with a value that isn t represented by any of the parameter classes in Table 15-1. Or, you might want to manually modify a parameter value before using it. In both of these scenarios, you need to use code to set the parameter value just before the database operation takes place. For example, consider the page shown in Figure 15-13. It includes two data-bound controls. The first is a list of all the customers in the database. Here s the markup that defines the list and its data source: <asp:SqlDataSource ID="sourceCustomers" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT CustomerID, ContactName FROM Customers" /> <asp:DropDownList ID="lstCustomers" runat="server" DataSourceID="sourceCustomers" DataTextField="ContactName" DataValueField="CustomerID" AutoPostBack="True"> </asp:DropDownList>

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You can bind the same data list object to multiple different controls. Consider the following example, which compares all the types of list controls at your disposal by loading them with the same information: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load ' Create and fill the collection. Dim fruit As New List(Of String)() fruit.Add("Kiwi") fruit.Add("Pear") fruit.Add("Mango") fruit.Add("Blueberry") fruit.Add("Apricot") fruit.Add("Banana") fruit.Add("Peach") fruit.Add("Plum") ' Define the binding for the list controls. MyListBox.DataSource = fruit MyDropDownListBox.DataSource = fruit MyHtmlSelect.DataSource = fruit MyCheckBoxList.DataSource = fruit MyRadioButtonList.DataSource = fruit ' Activate the binding. Me.DataBind() End Sub Figure 16-6 shows the rendered page. This is another area where ASP.NET data binding may differ from what you have experienced in a desktop application. In traditional data binding, all the different controls are sometimes treated like views on the same data source, and you can work with only one record from the data source at a time. In this type of data binding, when you select Pear in one list control, the other list controls automatically refresh so that they too have Pear selected (or the corresponding information from the same row). This isn t how ASP.NET uses data binding. If you want this sort of effect, you need to write custom code to pull it off.

Figure 15-13. Using parameters in a master-details page When the user picks a customer from the list, the page is posted back (because AutoPostBack is set to true) and the matching orders are shown in a GridView underneath, using a second data source. This data source pulls the CustomerID for the currently selected customer from the drop-down list using a ControlParameter: <asp:SqlDataSource ID="sourceOrders" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT OrderID,OrderDate,ShippedDate FROM Orders WHERE CustomerID=@CustomerID"> <SelectParameters> <asp:ControlParameter Name="CustomerID" ControlID="lstCustomers" PropertyName="SelectedValue" /> </SelectParameters> </asp:SqlDataSource> <asp:GridView ID="gridOrders" runat="server" DataSourceID="sourceOrders"> </asp:GridView> Now, imagine you want to limit the order list so it only shows orders made in the last week. This is easy enough to accomplish with a Where clause that examines the OrderDate field. But there s a catch. It doesn t make sense to hard-code the OrderDate value in the query itself, because the range is set based on the current date. And there s no parameter that provides exactly the information you need. The easiest way to solve this problem is to add a new parameter one that you ll be responsible for setting yourself: <asp:SqlDataSource ID="sourceOrders" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>"

' Call a subroutine with no parameters. MySub() ' Call a subroutine with two Integer parameters. MySub2(10, 20) ' Call a function with two Integer parameters and an Integer return value. Dim ReturnValue As Integer = AddNumbers(10, 10)

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