In this short tutorial, C++ Product Manager, David Millington, explains what event handlers are and how to use them in your C+ event/C++ application development. In an event receiver class, such as your form, you define event handlers, which are simply methods that match the event handler type that match the event that they will handle. They are assignable like method pointers to variables. Code that handles events, ie sees something happen, just calls that method pointer to invoke your method.