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What Is a "Method"?

A method is a basic part of a program. It can solve a certain problem, eventually take parameters and return a result.
A method represents all data conversion a program does, to resolve a particular task. Methods consist of the program’s logic. Moreover they are the place where the “real job” is done. That is why methods can be taken as a base unit for the whole program. This on the other hand, gives us the opportunity, by using a simple block, to build bigger programs, which resolve more complex and sophisticated problems. Below is a simple example of a method that calculates rectangle’s area:

static double GetRectangleArea(double width, double height)
{
double area = width * height;
return area;
}