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In the code-behind file, the NorthwindEntities object is created as a member variable of the page. That way, the object is available to any event handler. When the page first loads, the code grabs the product category information from the NorthwindEntities.Categories collection and binds it to the dropdown list: private NorthwindEntities entities = new NorthwindEntities(); protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { lstCategories.DataTextField = "CategoryName"; lstCategories.DataValueField = "CategoryID"; lstCategories.DataSource = entities.Categories; lstCategories.DataBind(); } } The DropDownList sets the AutoPostBack property to true, so the page is posted back as soon as the user picks a category. At this point, the SelectedIndexChanged event fires. The event handler retrieves the matching product records from the NorthwindEntities.Products collection, using the LINQ query shown here: protected void lstCategories_SelectedIndexChanged(object sender, EventArgs e) { int selectedID = Int32.Parse(lstCategories.SelectedValue); if (selectedID == -1) { // The "(Select a Category)" item was picked. // Don't show anything. gridProducts.DataSource = null; } else { // Query the products in the selected category. gridProducts.DataSource = from product in entities.Products where product.CategoryID == selectedID select new { Name = product.ProductName, Quantity = product.QuantityPerUnit, Stock = product.UnitsInStock }; } gridProducts.DataBind(); } This example uses two LINQ features. First, the where clause applies filtering to find the products in a specific category. Second, the new keywords uses the projection feature, which creates a new object with a subset of the product data. This is the reason the GridView in Figure 24-12 shows just three fields. (Another approach is to configure the GridView.Columns collection, as you learned to do in 16. But this example shows LINQ s ability to reshape your data on the fly.)

At this point, you might be wondering what all the fuss is about After all, the query shown here looks exactly like an ordinary LINQ to Objects query that acts on the NorthwindEntitiesProducts collection But there s a significant difference in the way this code works In a LINQ to Objects query, all the information is held in memory LINQ simply loops over it and picks out the objects you want But in a LINQ to Entities query, the information is drawn straight from the database using deferred execution It isn t until you bind the data or begin iterating over it that LINQ performs its query As a result, LINQ is able to turn your expression into a fine-tuned database query This difference has important performance implications.

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Figure 15-2. TriangleMIDlet rotating a 2D triangle You should be able to imagine how you d create this animation program without using a single line of M3G code: 1. Create a subclass of Canvas. 2. In the paint() method of the Canvas (or the animation loop for a GameCanvas), you will draw the triangle, and then set a timer to repaint. In each successive repaint (frame), you will draw the triangle in a new position. The coordinates can be calculated using simple trigonometry. 3. Create a MIDlet to host the custom Canvas. Figure 15-3 shows how you can animate the triangle in this MIDlet. In Figure 15-3, initially the three vertices (0,0), (3,0), and (3,3) define the triangle. Subsequent frames of the animation rotate the triangle around the origin at (0,0). Now that you are satisfied with your ability to create the same effect using MIDP s 2D graphics capability, we ll reveal to you that this animation is rendered using M3G. Yes, the M3G 3D API is used to rotate the triangle around the origin! The geometry engine built into M3G understands the math of the rotation and recalculates the coordinates, plus redraws the triangle in each frame for you. All that you need to do is tell it the initial coordinates of the triangle and around what to rotate that triangle. At this point, you are probably wondering what all of this has to do with 3D graphics. Here is the last secret that we have been keeping from you: the rotation you see in TriangleMIDlet is actually in 3D!

Listing 7-4. The Read RF Button Event Handler private void btnRead_Click(object sender, EventArgs e) { // Confirm the connection is available if (connection != null && connection.ConnectionState == ClientConnectionState.Open) { // Read tags through the synchronous GetTags function and display // in the text box foreach (TagReadEvent tre in connection.GetTags(TagDataSelector.All)) { string hex = HexUtilities.HexEncode(tre.GetId()); tbTag.Text = hex; tbTag.Refresh(); } } }

If you simply use LINQ to Objects, you need to perform a query for all the product records, load all the data into memory, and then discard the records and fields you don t want This creates extra work for the database server, slows down your web page, and uses more memory on the web server But when you use LINQ to Entities, you fetch only the records and fields you need So, instead of using a SQL command like this: SELECT * FROM Products LINQ to Entities creates a command that s more like this: SELECT ProductName, QuantityPerUnit, UnitsInStock FROM Products WHERE CategoryID=1 The where clause in the LINQ expression becomes the Where clause in your SQL Select statement The three fields you re using to create the projection become the three fields you re retrieving in your query The result is a faster and more efficient query.

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