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reference to the System.Transaction namespace, it is easy to enlist a new transaction, as you can see in Listing 4-44. Here you have an example that uses the TransactionScope class to control the commit action of the transaction. In the default scenario without TransactionScope, SubmitChanges() is the trigger that ultimately fires COMMIT TRANSACTION in the database. Alternatively, in Listing 4-44, you have enrolled the DataContext class in a custom transaction; thus you control the time at which COMMIT TRANSACTION is executed in the database. Listing 4-44. Using the TransactionScope Class Department d = db.Departments.Single<Department>(r => r.Name == "Executive"); d.Name = "TransactionDepartment"; using (TransactionScope ts = new TransactionScope()) { db.SubmitChanges(); ts.Complete(); } The functionality seen in Listing 4-44 gives you the fine-grained control over your transactions that you will need in n-tier applications. This control is not limited to just the SubmitChanges() method: you can include any method in the DataContext for example, ExecuteQuery() in a custom transaction and control its COMMIT, ROLLBACK, or other functionality. Along with the TransactionScope functionality that LTS provides, you can also use native database transactions to control the execution of your commands. In Listing 4-45, you can see an example of a try...catch...finally block that is using database transactions to control rollback and commit functions. In this example, you are first checking to see whether db.Connection is closed. If it is, you are opening it, because you cannot enlist a new transaction without an open connection. Next you begin the transaction, calling SubmitChanges() and calling Commit() or Rollback(), depending on the results of the try...catch block. Listing 4-45. Explicitly Using Native Database Transactions with LTS Department d = db.Departments.Single<Department> (r => r.Name == "TransactionDepartment2"); d.Name = "TransactionDepartment3"; if(db.Connection.State == ConnectionState.Closed) { db.Connection.Open(); } db.Transaction = db.Connection.BeginTransaction();

Figure 2 4. The properties for the graphic file in the Content project The project is now loading the graphic, and so the final step is to display it on the screen. This is achieved by adding a few new lines of code to the Draw function at the bottom of the source listing. The modified function is shown in Listing 2 3. Listing 2 3. Drawing the graphic file to the screen /// <summary> /// This is called when the game should draw itself. /// </summary> /// <param name="gameTime">Provides a snapshot of timing values.</param> protected override void Draw(GameTime gameTime) { // Clear the background GraphicsDevice.Clear(Color.CornflowerBlue); // Set the position for the sprite Vector2 position = new Vector2(100, 100); // Begin a sprite batch spriteBatch.Begin(); // Draw the sprite spriteBatch.Draw(_smileyTexture, position, Color.White); // End the sprite batch spriteBatch.End(); // Let the base class do its work base.Draw(gameTime); } We first declare a position for the graphic using a Vector2 structure. This structure is very important in XNA and we ll look at it in more detail later on. Then we use the spriteBatch object that the default code created for us to begin drawing a series of graphics to the screen. The spriteBatch object is then used once again to actually draw the graphic, specifying the graphic that we wish to draw,

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the position to draw it at, and the color to draw. The color is specified as white in this case; we will look at the behavior of this parameter shortly. Once the image is drawn, we call the spriteBatch.End method to tell XNA that we have finished drawing.

Listing 6-4. Texture Effect Material in Samples/Media/materials/scripts/Example.material material Examples/TextureEffect4 { technique { pass { ambient 0.3 0.3 0.3 scene_blend colour_blend cull_hardware none cull_software none texture_unit { texture Water02.jpg scroll_anim 0.01 0.01 } } } } It might be somewhat difficult to see on a static printed page, but the water texture in Figure 6-6 is animated. If you run the Demo_TextureFX sample you get a much better idea of what it looks like, but if that is not handy, imagine the waves on the water moving as a result of the texture scrolling set in motion in the texture unit block in Listing 6-4.

try { dbSubmitChanges(); dbTransactionCommit(); } catch { dbTransactionRollback(); throw; } finally { dbTransaction = null; } Another important aspect about transactions I want to touch on is the transaction isolation level I m not going to go into too much depth on this topic because 11 discusses concurrency, and this book isn t about database design; there are a few points, however, that you should understand about isolation and LTS Isolation level is, of course, what is used by the database to control locking and how/when one change is seen by other changes LTS uses the standard SystemDataIsolationLevel enumeration for controlling the isolation level The following are the enumeration values that can be set on your DataContextTransactionIsolationLevel property: Chaos: The pending changes from more highly isolated transactions cannot be overwritten.

NOTE The use of the word sprite dates back to the old 8-bit computers of the 1970s and 1980s, whose graphical capabilities were generally limited to moving only small 2D graphics around the screen. These graphics were given the name sprites in reference to their ability to make lively movements, as compared with background images that were usually static. Hardware capabilities are of course a world away in modern computer graphics, but the term has stuck around as a way of referring to moving 2D graphical images.

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