Code First in Entity Framework

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ASP.NET4

Not Generating Database by using Code first. here my code

namespace EFfistSample
{
    class Program
    {
        static void Main(string[] args)
        {
            var person = new Person { FirstName = "Sreekanth", LastName = "Vankamamidi", BirthDate = DateTime.Now };
            using (var context = new MyContext())
            {
                context.Persons.Add(person);
                context.SaveChanges();
            }
            Console.Write("Person Saved");
            Console.ReadLine();
        }
    }
}

person.cs

namespace EFfistSample
{
  public class Person
    {
      public int PersonID { get; set; }
      public string LastName { get; set; }
      public string FirstName { get; set; }
      public DateTime BirthDate { get; set; }

  }
}

namespace EFfistSample
{
   public class MyContext : DbContext
    {
       public MyContext()
       { }

       public DbSet<Person> Persons { get; set; }
    }
}

here it should generate database in sqlserver but it's not generating. plz help me
thank you.