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With the vertex data stored on the graphics card, it s time to render some triangles to the screen. You can use the same code of recipe 5-1, with two modifications. You will use the DrawPrimitive method, indicating you re going to render from the active VertexBuffer. Before you can do this, you need to activate your VertexBuffer. device.RenderState.CullMode = CullMode.None; basicEffect.World = Matrix.Identity; basicEffect.View = fpsCam.ViewMatrix; basicEffect.Projection = fpsCam.ProjectionMatrix; basicEffect.Texture = myTexture; basicEffect.TextureEnabled = true; basicEffect.Begin(); foreach (EffectPass pass in basicEffect.CurrentTechnique.Passes) { pass.Begin(); device.VertexDeclaration = myVertexDeclaration; device.Vertices[0].SetSource(vertBuffer, 0, VertexPositionTexture.SizeInBytes); device.DrawPrimitives(PrimitiveType.TriangleList, 0, 2); pass.End(); } basicEffect.End();

Once again, we will use an Entity Framework data model as the bridge between our program and the database. To do this, follow the steps set out in the Creating the Model section of 30.

Suppose you are writing some validation logic for a function and want to generate a typed exception on the client for a missing parameter. You can use the Error.argumentNull method to generate an exception of that type by passing the name of the missing parameter and a description as shown here:

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To avoid these issues, the following process is followed: 1 Turn off events from the BindingSource controls 2 Clone the business object 3 Save the clone of the business object 4 Rebind the BindingSource controls to the new object returned from Save(), if necessary 5 Turn on events from the BindingSource controls Turning off and on the events from the BindingSource controls ensures that any events from the data source won t be cascaded up to the UI during the update process This is important, because otherwise an exception will occur when rebinding the BindingSource controls to the new object returned from Save() As you ll see, this rebinding requires that the DataSource property first be set to null, which of course isn t a valid data source for the UI.

The default option for a network channel is not to use the network at all, but rather to run the server-side code inside the client process. This option offers the best performance, though possibly at the cost of security or scalability. The various trade-offs of n-tier deployments were discussed in 1. Even when running the server-side code in-process on the client, the data portal uses a proxy for the local channel : Csla.DataPortalClient.LocalProxy. As with all proxy classes, this one implements the Csla.DataPortalClient.IDataPortalProxy interface, exposing a standard set of methods and properties for use by Csla.DataPortal. Because this proxy doesn t actually use a network protocol, it is the simplest of all the proxies:

If you were to broadly characterize the source code of C and C++ programs, you might say that a C program is a set of functions and data types and that a C++ program is a set of functions and classes. A C# program, however, is a set of type declarations. The source code of a C# program or DLL is a set of one or more type declarations. For an executable, one of the types declared must be a class that includes a method called Main. A namespace is a way of grouping a related set of type declarations and giving the group a name. Since your program is a related set of type declarations, you will generally declare your program type inside a namespace you create.

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