What is the correct implementation for GetHashCode() for entity classes?

Question

Below is a sample implementation of overriding Object.Equals() for an entity base class from which all other entities in an application derive.

All entity classes have t

Answer 1

What about using the type as part of the hash code?
Would this be a good implementation?

public class Foo
{
    public int Id { get; set; }

    // other properties here
    // ......

    public override int GetHashCode()
    {
        int hash = 37;
        hash = hash * 23 + typeof(Foo).GetHashCode();
        hash = hash * 23 + Id.GetHashCode();
        return hash;
    }
}