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Now, insert a new interface into your project named IPointy using the Project ➤ Add New Item

menu option, as shown in Figure 9-1.

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Figure 9-1.

Interfaces, like classes, can be defined in any *.cs file.

At a syntactic level, an interface is defined using the C# interface keyword. Unlike other .NET

types, interfaces never specify a base class (not even System.Object) and their members never spec-

ify an access modifier (as all interface members are implicitly public and abstract). To get the ball

rolling, here is a custom interface defined in C#: