Ok, here is a good test case to demonstrate what I am talking about:

public class MainClass
   {
       public void Test()
       {
           ParentClass parent = new ParentClass();
           Console.WriteLine(parent.myClassList.Count + " items");

           Type listType = Type.GetType("Tools.MyClass");
           List<listType> list = parent.GetType().GetField("myClassList");
// the type or namespace name 'listType' could not be found
           list.Add(Activator.CreateInstance(listType)); // compiler error:
cannot convert form object to 'listType'

           Console.WriteLine(parent.myClassList.Count + " items");
           
       }
   }

   public class ParentClass
   {
       public List<MyClass> myClassList = new List<MyClass>();
   }

   public class MyClass
   {
       public string testString = "";
   }

See how do I make a generic reference of that List? I think in Java you can
do something like List<?> so you dont need to explicitly specify type but I
cant figure out how to do it in C#.

See I need to get a reference to that List using reflection without
explicitly specifying it's type, since it's type could be anything. Then I
need to add a new instance of that type to the list, again without explicitly
specifying it's type.

It has to be completely dynamic so that I can create an instance of a user
specified type and Add it to a List of that type.