public void Up(DbProvider db)
 {
     Table t = db.AlterTable("Movies");
     t.AddColumn<string>("PosterThumbnailUrl", 1024);
     t.Save();
 }
 public void Down(DbProvider db)
 {
     Table t = db.AlterTable("Movies");
     t.DropColumn("PosterThumbnailUrl");
     t.Save();
 }