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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 rich data controls you ll learn about in this chapter, because it comes equipped with the most ready-made functionality. This functionality includes

It highlights the row in the category list that corresponds to the current product. For example, if the current product is a Seafood category, the Seafood entry in the list box will be selected. This logic appears fairly involved, but it s really just an application of what you ve learned over the past two chapters. The full listing is as follows: Protected Sub lstProduct_SelectedIndexChanged(ByVal sender As Object, _ ByVal e As EventArgs) Handles lstProduct.SelectedIndexChanged ' Create a command for selecting the matching product record. Dim selectProduct As String = "SELECT ProductName, QuantityPerUnit, " & _ "CategoryName FROM Products INNER JOIN Categories ON " & _ "Categories.CategoryID=Products.CategoryID " & _ "WHERE ProductID=@ProductID" ' Create the Connection and Command objects. Dim con As New SqlConnection(connectionString) Dim cmdProducts As New SqlCommand(selectProduct, con) cmdProducts.Parameters.AddWithValue("@ProductID", _ lstProduct.SelectedItem.Value) ' Retrieve the information for the selected product. Using con con.Open() Dim reader As SqlDataReader = cmdProducts.ExecuteReader() reader.Read() ' Update the display. lblRecordInfo.Text = "<b>Product:</b> " & _ reader("ProductName") & "<br />" lblRecordInfo.Text &= "<b>Quantity:</b> " & _ reader("QuantityPerUnit") & "<br />" lblRecordInfo.Text &= "<b>Category:</b> " & reader("CategoryName") ' Store the corresponding CategoryName for future reference. Dim matchCategory As String = reader("CategoryName") ' Close the reader. reader.Close() ' Create a new Command for selecting categories. Dim selectCategory As String = "SELECT CategoryName, " & _ "CategoryID FROM Categories" Dim cmdCategories As New SqlCommand(selectCategory, con)

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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.

' Retrieve the category information, and bind it. lstCategory.DataSource = cmdCategories.ExecuteReader() lstCategory.DataTextField = "CategoryName" lstCategory.DataValueField = "CategoryID" lstCategory.DataBind() ' Highlight the matching category in the list. lstCategory.Items.FindByText(matchCategory).Selected = True End Using pnlCategory.Visible = True End Sub You could improve this code in several ways. It probably makes the most sense to remove these data access routines from this event handler and put them into more generic functions. For example, you could use a function that accepts a ProductName and returns a single DataRow with the associated product information. Another improvement would be to use a stored procedure to retrieve this information. The end result is a window that updates itself dynamically whenever a new product is selected, as shown in Figure 16-10.

The GridView provides a DataSource property for the data object you want to display, much like the list controls you saw in 15. 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 void Page_Load(object sender, EventArgs e) { // Define the ADO.NET objects. string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; string selectSQL = "SELECT ProductID, ProductName, UnitPrice FROM Products"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(selectSQL, con); SqlDataAdapter adapter = new SqlDataAdapter(cmd); // Fill the DataSet. DataSet ds = new DataSet(); adapter.Fill(ds, "Products"); // Perform the binding. GridView1.DataSource = ds; GridView1.DataBind(); } Remember, in order for this code to work you must have a connection string named Northwind in the web.config file (just as you did for the examples in the previous two chapters). Figure 16-1 shows the GridView this code creates.

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Figure 16-10. Product information This example still has one more trick in store. If the user selects a different category and clicks Update, the change is made in the database. Of course, this means creating new Connection and Command objects, as follows:

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