C# Console Application that Outputs a category based on input

I have a task to develop a windows application that collects employee information: Name and Number of items sold as input and outputs a summary of information in a way that groups the Salesperson based on the number of items sold (below 50 items, 50-99 items, 100-199 items and a level above 199 items) See below. Can you help me with this code. Here is the code am working with thus far:

using System;

namespace L0002B
{
    public class Salesperson
    {
        string Name { get; set; }
        int Quantity_Sold { get; set; }
        static void Main(string[] args)
        {
            System.Collections.Generic.List<Salesperson> Salesperson = new System.Collections.Generic.List<Salesperson>()
        {
             new Salesperson {Name="Donald Duck ",  Quantity_Sold=173},
             new Salesperson {Name="Mickey Mouse ",  Quantity_Sold=202},
             new Salesperson {Name="Snoopy  ",  Quantity_Sold=203},
        };
      
        }
        private static void Bonus(ref int Quantity_Sold)
        {
            if (Quantity_Sold >= 200)
            {
                Console.WriteLine("Above 199 items");
            }
            else if (Quantity_Sold >= 100)
            {
                Console.WriteLine("100-199 items");
            }
            else if (Quantity_Sold >= 50)
            {
                Console.WriteLine("50-99 items");
            }
            else
            {
                Console.WriteLine("Below 50 items");
            }
            Console.WriteLine("Bonus Report: " Bonus);
        }
    }
}

I want a output that provides a report that looks like this but I get a blank output instead. enter image description here