C# 5.0 Programmer's Reference

Code File Structure ❘ 41
}
namespace OrderEntry
{
public class OrderEntryClerk
{
...
}
}
}
...
If a file includes a using directive to indicate that it is using a namespace, it does not need to explicitly
identify the namespace to use the classes and other items it defines. You only need to explicitly use the
namespace if multiple included namespaces define items with the same name.
All program elements in a C# program must be inside a namespace. By default, any code files you
create include a namespace named after the project you initially created. For example, if you create
an application named OrderEntrySystem, by default its code is contained in the OrderEntrySystem
namespace.
You can view and modify the project’s default namespace by selecting Project ➪ Properties and looking
on the Application tab. Figure 3-7 shows the Application tab for the WindowsFormsApplication1
project. The default namespace is WindowsFormsApplication1.
Figure 3-7: A project’s property pages let you view and change the project’s
default namespace.
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