/// <summary>
 /// Saves the specified user.
 /// </summary>
 /// <param name="user">The user.</param>
 public void Save(User user)
 {
     if (this.users.ContainsKey(user.Login))
     {
         this.users[user.Login] = user;
     }
     else
     {
         this.users.Add(user.Login, user);
     }
 }
 /// <summary>
 /// Saves the specified user.
 /// </summary>
 /// <param name="user">The user.</param>
 public void Save(User user)
 {
     throw new NotImplementedException();
 }