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The GridView is the heavyweight of ASPNET data controls DetailsView: The DetailsView is ideal for showing a single record at a time, in a table that has one row per field The DetailsView also supports editing FormView: Like the DetailsView, the FormView shows a single record at a time and supports editing The difference is that the FormView is based on templates, which allow you to combine fields in a flexible layout that doesn t need to be table-based ListView: The ListView plays the same role as the GridView it allows you to show multiple records The difference is that the ListView is based on templates As a result, using the ListView requires a bit more work and gives you slightly more layout flexibility.

Listing 11-9. The isAuthorized() Function in the Post Model 1 2 3 4 5 6 7 function isAuthorized($user, $controller, $action) { if ($user['User']['role'] == 'admin') { return true; } else { return false; } }

The ListView isn t described in this book, although you can learn more about it in the Visual Studio Help, or in the book Pro ASPNET 35 in VB (Apress, 2008) In this chapter, you ll explore the rich data controls in detail..

The GridView is an extremely flexible grid control that displays a multicolumn table. Each record in your data source becomes a separate row in the grid. Each field in the record becomes a separate column in the grid. The GridView is the most powerful of the three rich data controls you ll learn about in this chapter, because it comes equipped with the most ready-made functionality. This functionality

Note You can also save the last selections in the Solver Parameters dialog box within a worksheet by

includes features for automatic paging, sorting, selecting, and editing. The GridView is also the only data control you ll consider in this chapter that can show more than one record at a time.

The $user array will contain the Auth component s retrieval of the user record where the username and password match, so line 2 uses this array rather than the Auth->user() function. Both methods for checking a user s role will work; following the convention of having larger models than controllers will mean that most of the time you ll check user roles in the model.

The GridView provides a DataSource property for the data object you want to display, much like the list controls you saw in 16 Once you ve set the DataSource property, you call the DataBind() method to perform the data binding and display each record in the GridView However, the GridView doesn t provide properties, such as DataTextField and DataValueField, that allow you to choose what column you want to display That s because the GridView automatically generates a column for every field, as long as the AutoGenerateColumns property is True (which is the default) Here s all you need to create a basic grid with one column for each field: <asp:GridView ID="GridView1" runat="server" /> Once you ve added this GridView tag to your page, you can fill it with data Here s an example that performs a query using the ADO.

NET objects and binds the retrieved DataSet: Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles MeLoad ' Define the ADONET objects Dim connectionString As String = _ WebConfigurationManagerConnectionStrings("Northwind")ConnectionString Dim selectSQL As String = _ "SELECT ProductID, ProductName, UnitPrice FROM Products" Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(selectSQL, con) Dim adapter As New SqlDataAdapter(cmd) ' Fill the DataSet Dim ds As New DataSet() adapterFill(ds, "Products") ' Perform the binding GridView1DataSource = ds GridView1DataBind() End Sub Remember, in order for this code to work you must have a connection string named Northwind in the webconfig file (just as you did for the examples in the previous two chapters) Figure 17-1 shows the GridView this code creates Of course, you don t need to write this data access code by hand.

As you learned in the previous chapter, you can use the SqlDataSource control to define your query You can then link that query directly to your data control, and ASPNET will take care of the entire data binding process..