Help with arrays in C#

[apricotsun]

I am new to C# programming and have been working on this project for a week. Here's the logic:

1. Output total number of salary ranges:
200 - 299, 300-399, 400-499, 500-599, 600-699, 700-799, 800-899,
1000+
2. Input gross sales.
3. If quit (-1) go to step 8
4. Calculate the salary =$200 + 9% * gross sales (entered by user)
5. Determine the salary range that the calculated salary falls into.
6. Increment a counter for the salary range that was determined.
7. Repeat steps 2 thru 6.
8. Display the number of salaries falling into the salary ranges as indicated.
9. End.

Any help would be greatly appreciated.

 static void Main(string[] args)
      {

         int grossSales = 0;

         while (grossSales != -1)
         {
            Console.Write("Enter in the sales for the salesperson (-1 to quit): ");
            grossSales = Int32.Parse(Console.ReadLine());

            //store grossSales in each salary range array
            int[] frequency = new int[9];

            //calculate the salary for each item stored in salary range array
            for (int counter = 0; counter < frequency; counter++)
            frequency[counter] = 200 + ((9/10)* grossSales);
         
            int[] getSalary = new int[];// array of salary of the salespeople

            //for each salary, increment the appropriate frequency
            foreach (int salary in getSalary)
            ++frequency[salary / 10];

            Console.WriteLine("{0,20}{1,30}", "Salary Range", "Number of Salespeople");

            //for each salary, print number
            for (int salary = 0; salary < frequency.Length; salary++)
            {
            if (salary == 10)
               Console.Write("1000 and over: ");
            else
               Console.Write("{0:D2}{1:D2}: ", salary * 10, salary * 10 + 9);

         }
       
         }
      }
   }
}