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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.

Note The device variable is just a shortcut you may want to create for GraphicsDevice, because you will use it very often. Because you need to relink to GraphicsDevice every time your application recovers focus (for example, after a minimizing operation), you should put the device = graphics.GraphicsDevice; line in the LoadContent method.

For example, the following code shows a program that consists of three type declarations. The three types are declared inside a new namespace called MyProgram. namespace MyProgram { DeclarationOfTypeA DeclarationOfTypeB class C { static void Main() { ... } } } Namespaces are covered in more detail in 10. // Create a new namespace. // Declare a type. // Declare a type. // Declare a type.

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But it would have the advantage that, as a result, your staff would now know how to build a truck from spare parts The problem with this approach is that most companies are not in the truck manufacturing business They are in some other line of work Building a truck would be a costly diversion from their core business And, during that year, the company could not use the truck to make deliveries The same principle applies to building a marketing database from spare parts No one in most companies (including the IT department) has done this before It takes a long time, since there is a learning curve associated with each process It takes time to study the.

Since a C# program is just a set of type declarations, learning C# consists of learning how to create and use types. So, the first thing you need to do is to look at what a type is. You can start by thinking of a type as a template for creating data structures. It isn t the data structure itself, but it specifies the characteristics of objects constructed from the template. A type is defined by the following elements: A name A data structure to contain its data members Behaviors and constraints For example, Figure 3-1 illustrates the components of two types: short and int.

Creating an actual object from the type s template is called instantiating the type. The object created by instantiating a type is called either an object of the type or an instance of the type. The terms are interchangeable. Every data item in a C# program is an instance of some type a type either provided by the language, provided by the BCL or another library, or defined by the programmer. Figure 3-2 illustrates the instantiation of objects of two predefined types.

available software packages (there are scores of them) and to install and learn to use the ones chosen When the database is nished, it will not work as well as one that was built by an experienced service bureau that has already built dozens of them and has a trained technical staff whose only job is building and maintaining marketing databases Finally, you cannot get any bene t from the home-grown database during the year or more that is needed to build it You get the bene t only after it is up and running Once your database is up and running, it can be migrated to inhouse maintenance at any time In fact, however, if the database is built correctly, your marketers will be so happy with the results of using it that they will forget about wanting to maintain it.

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