C# Language Specification

Partial modifier

The partial modifier is used to indicate that this class-declaration is a partial type declaration. Multiple partial type declarations with the same name within an enclosing namespace or type declaration combine to form one type declaration, following the rules specified in §10.2.

Having the declaration of a class distributed over separate segments of program text can be useful if these segments are produced or maintained in different contexts. For instance, one part of a class declaration may be machine generated, whereas the other is manually authored. Textual separation of the two prevents updates by one from conflicting with updates by the other.

3.