/// <summary>
 /// Run the Change Password operation in a background task.
 /// </summary>
 /// <param name="password"></param>
 /// <param name="newPassword"></param>
 /// <returns></returns>
 private OperationReturnMessage ChangePassword(string password, string newPassword)
 {
     Device.BeginInvokeOnMainThread(() => this.LabelChangePasswordMessage.Text = "Waiting...");
     return(ServerOperations.ChangePassword(CredentialManager.Username, password.Trim(), newPassword.Trim()));
 }