Data Annotations ->Mapping -> Entity Framework

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ConsoleBlog.Models
{
    public class Post
    {

        private ICollection<PostAnswer> answers;
        private ICollection<Tag> tags;

        public Post()
        {
            this.answers = new HashSet<PostAnswer>();
            this.tags = new HashSet<Tag>();
        }

        //primary key
        [Key]
        public int PostId { get; set; }

        [Required] //set to not nulluble
        public string Title { get; set; }

        [Column("New Name")]
        public string Content { get; set; }

        [NotMapped]
        public DateTime CreatedOn { get; set; }

        //foreign key
        [ForeignKey("Category")]
        public int CategoryId { get; set; }

        //navigation property
        public virtual Category Category { get; set; }

        public virtual ICollection<PostAnswer> Answers
        {
            get { return this.answers; }

            set { this.answers = value; }
        }

        public virtual ICollection<Tag> Tags
        {
            get { return this.tags; }

            set { this.tags = value; }
        }

        public PostType Type { get; set; }

        [Timestamp]
        public byte[] RowVersion { get; set; }

        //includes propertiest from this class(class have [ComplexType])
        public PostDetail Detail { get; set; }

    }
}

namespace ConsoleBlog.Models
{
    [ComplexType]
    public class PostDetail
    {
        public string CreatedByUser { get; set; }

        public bool IsDeleated { get; set; }
    }
}