Array with barchart question.

Question

Hi, I was just wondering if anyone could help me with this problem I have. I want to create a bar chart format, to display how many scorers are in each part of the grade array. I want to increment the bar chart with a * everytime a number goes in to the grades array. I have the code mostly done, just can't seem to get the bar chart to work. Any help would be greatly appreciated, thank you.

  static void Main(string[] args)

        {

            Console.WriteLine("Enter the mark you received, enter -999 to quit");

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

            

            int[] grade = new int[5];

            while (mark != -999)

            {

                if (mark >= 70 && mark <= 100)

                {

                    grade[0]++;

                   

                }

                else if (mark >= 60 && mark <= 69)

                {

                    grade[1]++;

                   

                }

                else if (mark >= 50 && mark <= 59)

                {

                    grade[2]++;

                    

                }

                else if (mark >= 40 && mark <= 49)

                {

                    grade[3]++;

                   

                }

                else if (mark >= 0 && mark <= 39)

                {

                    grade[4]++;

                    

                }

                Console.WriteLine("Enter the mark you received, enter -999 to quit");

                mark = Convert.ToInt32(Console.ReadLine());

            }

            for (int i = 0; i < grade.Length; i++)

            {

                Console.WriteLine( "{0,-15} {1,-15}", grade[i], "*");

            }

            Console.ReadLine();

        }