Methods

Methods name reusable work and return a result to the caller.

Methods.cs

using System;

class Program
{
    static int Square(int value)
    {
        return value * value;
    }

    static void Main()
    {
        int side = ;
        int area = Square(side);

        Console.WriteLine($"side={side}");
        Console.WriteLine($"area={area}");
    }
}

using System;

class Program
{
    static int Square(int value)
    {
        return value * value;
    }

    static void Main()
    {
        int side = ;
        int area = Square(side);

        Console.WriteLine($"side={side}");
        Console.WriteLine($"area={area}");
    }
}

using System;

class Program
{
    static int Square(int value)
    {
        return value * value;
    }

    static void Main()
    {
        int side = ;
        int area = Square(side);

        Console.WriteLine($"side={side}");
        Console.WriteLine($"area={area}");
    }
}

method call A method call runs the named method and can use the returned value in another expression.