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Note You don t need to bother to load textures if your model uses them. Model files already include information about the textures they use. Because this information includes the path where the texture files should be located, you just need to know this path and then copy the texture files to the corresponding path. You can find out the texture paths by examining the model files (in a text editor, for example) or by including the model in the project and compiling it. XNA Game Studio presents the Content Pipeline path errors stating where the model looked for the textures.

Listing 13-4. Button3_Click()

Create the WireUpKeyEvents function that will create an Observable collection from the KeyUp events and create subscription to that collection by adding the following code:

' Create connection Dim conn As SqlConnection = New SqlConnection( _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" _ ) ' Create command Dim cmd As SqlCommand = conn.CreateCommand() ' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_DbException_1" Try ' Open connection conn.Open() ' Execute stored procedure cmd.ExecuteNonQuery() Catch ex As System.Data.SqlClient.SqlException Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Number: " & ex.Number.ToString() str &= ControlChars.NewLine str &= "Message: " & ex.Message str &= ControlChars.NewLine str &= "Class: " & ex.Class.ToString() str &= ControlChars.NewLine str &= "Procedure: " & ex.Procedure.ToString()

Summary

&= &= &= &=

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ControlChars.NewLine "Line Number: " & ex.LineNumber.ToString() ControlChars.NewLine "Server: " & ex.Server.ToString()

In this chapter, you learned the basics of 3D graphics programming. Although XNA provides you with many built-in classes and methods that reduce the program s complexity, there are still a lot of concepts to understand. Be sure you understand the following concepts before you go on to the next chapter: What vertices are and what type of information can be used when defining them What a vertex buffer is and how to use it Why matrices are important, and how to use them to perform transformations in 3D objects What the projection matrix is, which types of projections XNA supports, and how to use them What the view matrix is and how you create it in XNA What the world matrix is, and how to use it to perform operations in all 3D scenes What models and meshes are, and how to load and render them in XNA

MessageBox.Show(str, "Database Exception") Catch ex As System.Exception Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Exception Message: " & ex.Message MessageBox.Show(str, "General Exception") Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block closing the connection", "Finally") conn.Close() End If End Try

6. Run the program with Ctrl+F5, then click the Database Exception-1 button. You see the message box in Figure 13-8. Click OK to close the message box, then OK to close the next one, then close the window.

In the next chapters, you ll create a complete 3D game, so you ll be able to better exercise and explore these concepts.

private void WireUpKeyEvents() { var keys = Observable.FromEvent<KeyEventArgs>(txtZipCode, "KeyUp").Throttle(TimeSpan.FromSeconds(1)).DistinctUntilChanged(); keys.ObserveOn(Deployment.Current.Dispatcher).Subscribe(evt => { if (txtZipCode.Text.Length >= 5) { weatherClient.GetWeatherByZipCodeAsync(txtZipCode.Text); } }); } 5. Press F5 to run the application. You should see a screen prompting you to enter the US zip code to retrieve the current weather for. If you enter your zip code, you should get a reasonable estimate of your current weather, both on the Fahrenheit and Celsius scales. You should also see a small picture with a visual representation of the current weather conditions. Figure 18 10 shows sample output for the Jacksonville, FL area (zip code of 32202 ).

Observe the caption and contents of the message box. The source, message, name of the stored procedure, exact line number where the error was found, and name of the server are all displayed. You obtained this detailed information about the exception from the SqlException object.

In the sp_DbException_1 stored procedure, you first found the number of orders in the Orders table and stored the number in a variable called @ordercount:

n this chapter, you ll learn some of the concepts related to the rendering pipeline, shaders, and effects. The rendering pipeline is responsible for rendering a 3D scene into a 2D image, which can then be drawn on the screen. You can use shaders to program some stages of the rendering pipeline, and use effects to describe a combination of shaders and configurations for the fixed stages of the rendering pipeline. This flexibility allows you to create custom visual effects, improving the visual aspect of the final image.

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