Methods

No params:

Console.WriteLine("Generating random numbers:");
DisplayRandomNumbers(); // 17 29 46 36 3 

void DisplayRandomNumbers() 
{
    Random random = new Random();

    for (int i = 0; i < 5; i++) 
    {
        Console.Write($"{random.Next(1, 100)} ");
    }

    Console.WriteLine();
}

Using parameters:

CountTo(5);

void CountTo(int max) 
{
  for (int i = 0; i < max; i++)
  {
    Console.Write($"{i}, "); // 0, 1, 2, 3, 4
  }
}

Optional parameters:

CountTo();

void CountTo(int max = 10) 
{
  for (int i = 0; i < max; i++)
  {
    Console.Write($"{i}, "); // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  }
}

Returning values:

int sum = SumTo(5);
Console.Write($"sum: {sum}"); // sum: 15

int CountTo(int max) 
{
  int result = 0;

  for (int i = 1; i <= max; i++)
  {
    result += i;
  }

  return result;
}

Stateless

The following code is stateless because it doesn’t require to store any state to work, you just call the static method WriteLine from Console class.

Console.WriteLine("Hello World!");

Stateful

The following code is stateful because it is required to store previous information of the state to calculate next random value.

Random dice = new Random();
int roll = dice.Next(1, 7);