Why does the following doesn't compile? (involves generics and inheritance in c#)

Question

This compiles:

    class ReplicatedBaseType
    {
    }

    class NewType: ReplicatedBaseType
    {
    }

    class Document
    {
    ReplicatedBas         


        

Answer 1

This code compiles in VS2010, net framework 4

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

namespace ConsoleApplication2
{
    class ReplicatedBaseType
    {
    }

    class NewType : ReplicatedBaseType
    {
    }

    class Document
    {
        ReplicatedBaseType BaseObject;

        Document()
        {
            BaseObject = new NewType();
        }
    }
    interface DalBase  where T: ReplicatedBaseType
    {
    }

    class DalBaseExample : DalBase where T: ReplicatedBaseType
    {

    }
    class DocumentTemplate
    {
        DalBase BaseType;
        DocumentTemplate ()
        {
            BaseType = new DalBaseExample(); // no error here
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}