Partial Classes and Methods in C#

You can split the implementation of a class, a struct, a method or an interface in multiple .cs files by using the partial keyword.

Multiple developers can work simultaneously on the same class in different files.

Partial Methods

• A partial class may contain partial methods
• One part of the class contains the signature of the method
• An optional implementation may be defined in the same part or another part
• Must use partial keyword and must return void 
• both declaration and implementation of the method must have the partial keyword