/// <summary>
        /// Locks a bikestand and updates the interface
        /// </summary>
        private void Lock()
        {
            BikeStandRegistration bikestandRegistration = null;

            if (int.TryParse(LockID, out int convertedLockID))
            {
                bikestandRegistration = serverClient.Lock(convertedLockID);
            }
            else
            {
                IsLockErrorVisible = true;
            }
            if (bikestandRegistration != null)
            {
                BikeStation bikeStation = serverClient.GetBikeStation("" + bikestandRegistration.BikeStandID);
                IsAddFriendEnabled   = true;
                IsLockIDEnabled      = false;
                LockVisible          = false;
                UnlockVisible        = true;
                IsLockErrorVisible   = false;
                IsAddFriendVisible   = true;
                BikeStationText      = String.Format("Your bike was locked at {0} on the {1}", bikeStation.title, bikestandRegistration.RegistrationTime);
                IsBikeStationVisible = true;
            }
            else
            {
                IsLockErrorVisible = true;
            }
        }
        /// <summary>
        /// This method updates the interface according to the relevant data from the backend when the Actionview appears
        /// </summary>
        public void OnAppearing()
        {
            if (sharedData.ScannedBikestandID != null)
            {
                int qrLockID;
                if (int.TryParse(sharedData.ScannedBikestandID, out qrLockID))
                {
                    LockID = "" + qrLockID;
                }
            }
            sharedData.ScannedBikestandID = null;
            BikeStandRegistration bikestandRegistration = serverClient.GetLockedBikestand();

            if (bikestandRegistration != null)
            {
                LockID             = "" + bikestandRegistration.BikeStandID;
                LockVisible        = false;
                UnlockVisible      = true;
                IsLockIDEnabled    = false;
                IsAddFriendEnabled = true;
                IsAddFriendVisible = true;
                BikeStation bikeStation = serverClient.GetBikeStation("" + bikestandRegistration.BikeStandID);
                if (bikeStation != null)
                {
                    BikeStationText      = String.Format("Your bike was locked at {0} on the {1}", bikeStation.title, bikestandRegistration.RegistrationTime);
                    IsBikeStationVisible = true;
                }
                String sharedWithUsername = serverClient.GetSharedUsername();
                if (!String.IsNullOrEmpty(sharedWithUsername))
                {
                    sharedAccessTo     = sharedWithUsername;
                    SharedWithText     = "Shared with: " + sharedAccessTo;
                    IsShared           = true;
                    IsAddFriendEnabled = false;
                }
            }
            else
            {
                IsAddFriendVisible   = false;
                IsBikeStationVisible = false;
                IsShared             = false;
                IsAddFriendEnabled   = true;
            }
        }