C# Coding help

I am a novice when it comes to programming, but do have a slight understanding of how. I read a lot of C# books and patterns books, and I am stumped on how to perform something. So basically what I am trying to do, is I have a base class which has all properties and methods that I need. I then will have 1 to n child classes that will inherit the base class, these child classes will only contain some new properties, and will override a method in the base class.

I am not sure if I am going about it the wrong way or not, like I said I am a novice, but I am not sure what class will need to be created, so based on some patterns I created a factory class, that creates the proper class based on users choice. When I instantiate the classes I to them as the base class, and because I do this, I cannot access the properties in the child classes, and I am curious on how to go about doing it properly. Below is a code example, to give an understanding of what I mean, as I am obviously going about it the wrong way, or I am just missing something, but any help is greatly appreciated, in my learning experience.

namespace Test
{
  public enum ClassTypes
  {
    ChildClass,
    Default
  }

  public class BaseClass
  {
    public Int64 Id { get; set; }
    public string Details { get; set; }
    
    // Child classes will override this method
    public virtual void Save()
    {
      Console.WriteLine("Saving.....");
      Console.WriteLine("Id: {0} - Details: {1}", this.Id, this.Details);
    }
  }

  public class ChildClass : BaseClass
  {
    public string ExtraDetails { get; set; }

    public override void Save()
    {
      // Call base's save method
      base.Save();
      Console.WriteLine("Extra Details: {0}", this.ExtraDetails);
    }
  }

  // Factory Class to instansiate proper class
  public static class ClassFactory
  {
    public static BaseClass CreateClass(ClassTypes classType)
    {
      switch (classType)
      {
        case ClassType.ChildClass:
          return new ChildClass();
        default:
          return new BaseClass();
      }
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      BaseClass bc1 = ClassFactory.CreateClass(ClassTypes.Default);
      BaseClass bc2 = ClassFactory.CreateClass(ClassTypes.ChildClass);

      IList<BaseClass> list = new List<BaseClass>();

      bc1.Id = 1;
      bc.Details = "Testing Base Class";
      list.Add(bc1);

      bc2.Id = 2;
      bc2.Details = "Testing child class";
      // Can NOT access because type being BaseClass
      bc2.ExtraDetails = "Extended testing";
      list.Add(bc2);

      foreach (BaseClass bc list)
      {
        bc.Save();
      }

      Console.ReadLine();
    }
  }
}

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