How to make a nullable property in EF Codefirst?

Question

I have two POCOs in my \"Bookshelf\" test application:

/// 

/// Represents a book
/// 
public class Book
{
    public int ID { get         


        

Answer 1

If you are talking about a simple property like int, bool, or float use int?, bool?, or float?

like

 public int? ID { get; set; }
 public bool? Exists { get; set; }