/// <summary>
        /// Back button event
        /// </summary>
        /// <returns> true if navigation pushasync is succeed</returns>
        protected override bool OnBackButtonPressed()
        {
            AccountSignIn accountSignIn = new AccountSignIn();

            Navigation.PushAsync(accountSignIn);
            return(true);
        }
        /// <summary>
        /// Event when "SIGN OUT" button is clicked.
        /// </summary>
        /// <param name="sender"> Parameter about which object is invoked the current event. </param>
        /// <param name="args"> Event arguments. </param>
        public async void SignOutClicked(object sender, EventArgs args)
        {
            accountAPIs.AccountDelete(account);

            AccountSignIn accountSignIn = new AccountSignIn();

            await DisplayAlert("Account Deleted", "ID : " + account.UserId, "OK");

            await Navigation.PushAsync(accountSignIn);
        }