using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Made by David Alejandro Morales Sosa");

        Console.WriteLine("--------------------------------------");

        Console.WriteLine("Introduce the min value: ");

        int n1 = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Introduce the max value: ");

        int n2 = Convert.ToInt32(Console.ReadLine());

        int counter = 0;

        int sum = 0;

        double average = 0;

        for (int i=n1; i<=n2; i++)

        {

            Console.Write("{0} ", i);    //Print number

            counter++;                   //Count

            sum += i;                    //Add number

        }

        average = sum / counter;         //Calculate average

        Console.WriteLine("\nResults\n");

        Console.WriteLine("Counter: {0}", counter);

        Console.WriteLine("Sum: {0}", sum);

        Console.WriteLine("Average: {0}", average);

    }

}

​