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Even though you included a single code line (for creating the mySprite1 object), a lot of things are going on. You created your sprite class by using the content manager to load the Texture2D based on the image asset name, ball. You also defined the sprite position as (0, 0) and decided on the sprite size: 64 pixels wide and 64 pixels tall. For the SpriteBatch s creation, you re passing the graphics device as a parameter. In the previous chapter, we mentioned that the device (represented here by the GraphicsDevice variable) is your entry point to the graphics handling layer, and through it you do any graphical operations. Here, you are informing the SpriteBatch which device it should use when drawing the sprites. In the next section, you ll see how to use the device to change the program s window size. It s always a good programming practice to destroy everything you created when the program ends. To do this, you need to dispose of the texture of clsSprite you created in the LoadContent method. As you probably guessed, you do this in the UnloadContent method. The code for disposing of the object follows: protected override void UnloadContent() { // Free the previously allocated resources mySprite1.texture.Dispose(); }

4. From Database Explorer, drag the Customers table onto the edit window. You ll see the screen in Figure 18-17. Notice that the CustomerID column is marked as the primary key (with a key icon). You now have a typed dataset with one table in it.

s Note Typed datasets can have as many tables and the same kind of relationships as untyped tables,

Note You could also create a Dispose method in the clsSprite class to dispose of the texture, and call

and VBE lets you create such things visually, but we only need the Customers table, so that s all we ll cover here.

5. Replace the code in Module1.vb with the code in Listing 18-3.

it from the UnloadContent method. This would be a more object-oriented code practice. It s up to you to choose the code practice you think is best.

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Imports System.Data.SqlClient Module Module1 '<Table(Name:="Customers")> _ 'Public Class Customers ' <Column(Id:=True)> _ ' Public customerId As String ' <Column()> _ ' Public companyName As String ' <Column()> _ ' Public city As String ' <Column()> _ ' Public country As String 'End Class Sub Main(ByVal args As String()) ' Connection string Dim connString As String = _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" ' Create connection Dim conn As SqlConnection = New SqlConnection(connString) ' Create dataset Dim ds As TypedCustomers = New TypedCustomers() ' Create data adapter Dim da As SqlDataAdapter = New SqlDataAdapter( _ "select " _ & " * " _ & "from " _ & " customers " _ , conn)

Figure 4 15. Device registration page In the following section, you will learn tips and tricks to make your life easier when you begin to debug and test using a real device.

' Fill data table da.Fill(ds, "Customers") ' Query data table Dim custs = _ From c In ds.Customers _ Select _ c.customerid, _ c.companyname ObjectDumper.Write(custs) End Sub End Module

Finally, you need to include code to draw the sprite using the SpriteBatch object you created. You use the SpriteBatch, as its name suggests, to draw a batch of sprites, grouping one or more calls to its Draw method inside a block started by a call to the Begin method and closed by a call to the End method, as follows: protected override void Draw(GameTime gameTime) { graphics.GraphicsDevice.Clear(Color.CornflowerBlue); spriteBatch.Begin(); mySprite1.Draw(spriteBatch); spriteBatch.End(); base.Draw(gameTime); } The Begin method can also receive parameters that will be used when rendering every sprite in the block. For instance, if the texture has transparency information, you can tell the SpriteBatch to take this into account when drawing, by changing the Begin code line to the following: spriteBatch.Begin(SpriteBlendMode.AlphaBlend);

6. Run the code with Ctrl+F5 and you should see the result in Figure 18-18.

You re using a typed dataset, so you can t just add a new data table to it as you did for the untyped dataset in LinqToDataSet. Instead of using LINQ to SQL to access the database, you filled the Customers data table with a data adapter (and you added an Imports statement for System.Data.SqlClient because you now need to use SqlConnection and SqlDataAdapter).

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