A type-declaration is a class-declaration (§17.1), a struct-declaration (§1 8.1), an interface-declaration (§20.1), an enum-declaration (§21.1), or a delegate-declaration (§22.1). type-declaration: class-declaration struct-declaration interface-declaration enum-declaration delegate-declaration A type-declaration can occur as a top-level declaration in a compilation unit or as a member declaration within a namespace, class, or struct. When a type declaration for a type T occurs as a top-level declaration in a compilation unit, the fully qualified name of the newly declared type is simply T. When a type declaration for a type T occurs within a namespace, class, or struct, the fully qualified name of the newly declared type is N.T, where N is the fully qualified name of the containing namespace, class, or struct. A type declared within a class or struct is called a nested type (§17.2.6). The permitted access modifiers and the default access for a type declaration depend on the context in which the declaration takes place (§10.5.1): ? Types declared in compilation units or namespaces can have public or internal access. The default is internal access. ? Types declared in classes can have public, protected internal, protected, internal, or private access. The default is private access. ? Types declared in structs can have public, internal, or private access. The default is private access.
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