/// <summary>
 /// Removes a user from the management system
 /// </summary>
 /// <param name="user">The user to be removed</param>
 public void RemoveUser(FTPUser user)
 {
     _users.Remove(user);
 }
 /// <summary>
 /// Adds a user to the management system
 /// </summary>
 /// <param name="user">The user to be added</param>
 public void AddUser(FTPUser user)
 {
     _users.Add(user);
 }