using System;

public class Program

{

    public static void Main()

    {

        int[] allgrades = new int[20]

        {

        6,7,7,8,5,4,7,9,6,8,4,5,7,6,8,9,7,5,6,4

        }

​

​

        ;

        bool vFound = false;

        int vGrade;

        int vCount = 0;

        Console.WriteLine("Please enter a mark to search for:");

        vGrade = int.Parse(Console.ReadLine());

        do

        {

            if (allgrades[vCount] == vGrade)

            {

                vFound = true;

                Console.WriteLine("The mark was found");

                vCount++;

            }

            else

            {

                vCount++;

            }

        }while ((vFound == false) && (vCount < allgrades.Length));

​

​

        if (vFound == false)

        {

            Console.WriteLine("The value was not found");

        }

        Console.WriteLine("The loop ran " + vCount + " times.");

​

    }

}