Dynamically override toString

public class Person
{
    string FName {get;set;}
    string LNAme {get; set;}
    int Age {get;set;}

     public string ToString(Person obj)
        {
            string result = string.Empty;
            obj.GetType().GetProperties().ToList().ForEach(p =>
            {
                result += string.Concat(p.Name + ": " + p.GetValue(obj) + "\r\n");

            });
            return result;
        }
}

//This is nice becasue you don't have to worry about how many properties you add, delete or change