public UserDTO Register(UserDTO user, string password)
{
var entity = GetUserByUserName(user.UserName, false);
if (entity != null) throw new Exception("User is already registered");
var dbUser = user.ProjectedAs<User, int>();
dbUser.Password = PasswordHash.CreateHash(password);
Repository.Add(dbUser);
Repository.UnitOfWork.Commit();
return dbUser.ProjectedAs<UserDTO, int>();
}