Methods/Functions

console.writeline - Writes the specified data, followed by the current line terminator, to the standard output stream. wherever it has been used.

For details check below urls

https://msdn.microsoft.com/en-us/library/586y06yf(v=vs.110).aspx

https://msdn.microsoft.com/en-us/library/system.console.writeline(v=vs.110).aspx

https://msdn.microsoft.com/en-us/library/swx4tc5e(v=vs.110).aspx

return in a function.

The return statement terminates execution of the method in which it appears and returns control to the calling method. It can also return an optional value. If the method is a void type, the return statement can be omitted.

class ReturnTest

static double CalculateArea(int r)

            double area = r * r * Math.PI;

           return area;

static void Main()

 int radius = 5;

double result = CalculateArea(radius);

Console.WriteLine("The area is {0:0.00}", result);

 // Keep the console open in debug mode.

 Console.WriteLine("Press any key to exit.");

Console.ReadKey();

 // Output: The area is 78.54