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Partial classes are classes that can be split over multiple files, making it éasier to déal with large quantities of code. At compile time the partial classes are grouped together, thus logically maké no difference to the output. An example of the use of partial classes may be the separation of user interface logic and processing logic. A primary benefit of partial classes is allowing different programmers to work on different parts of the same class at the same time. They also maké automatically generated code éasier to interpret, as it is separated from other code into a partial class.

Partial classes have been around in SmallTalk under the name of Class Extensions for considerable time.

In pre-beta versions of Visual Studio 2005 the partial keyword was known as "expands" in Visual Basic.

With the arrival of the .NET framework 2 Microsoft then introduced partial classes (see partial types), supported in both C# 2.0 and Visual Basic 2005.