public CompareField SortBy = CompareField.Name;

Just trying to understand this line of code....

public CompareField SortBy = CompareField.Name;  just need a quick explanation...

from

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    class CarComparer : IComparer<Car>


    {
  
        
        public enum CompareField
  {
      Name,
      MaxMph,
      Horsepower,
      Price,
  }
       public CompareField SortBy = CompareField.Name;
 public int Compare(Car x, Car y)
        {
            switch (SortBy)
            {
                case CompareField.Name:
                    return x.Name.CompareTo(y.Name);
                case CompareField.MaxMph:
                    return x.MaxMph.CompareTo(y.MaxMph);
                case CompareField.Horsepower:
                    return x.Horsepower.CompareTo(y.Horsepower);
                case CompareField.Price:
                    return x.Price.CompareTo(y.Price);
            }
            return x.Name.CompareTo(y.Name);
        }
        }
    }
}

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