MyDiplom/BuyPage.xaml.cs

using CommunityToolkit.Maui.Views;

using MyDiplom.Models;
using MyDiplom.ViewModels;

using Windows.System;

namespace MyDiplom;

public partial class BuyPage : Popup
{
    public BuyPage()
    {
        InitializeComponent();

    }
    ApplicationUser User { get; set; } = new ApplicationUser();
    private void CloseButtonClicked(object sender, EventArgs e)
    {
        Close();
    }
    private void BuyButtonCliked(object sender, EventArgs e)
    {
        string amountText = AmountEntry.Text;
        if (decimal.TryParse(amountText, out decimal amount))
        {
            //User.Balance += amount;
            //var userViewModel = (BindingContext as UserViewModels);
            //if (userViewModel != null)
            //{
            //    userViewModel.User.Balance += amount;

            //}
            var userViewModel = (BindingContext as UserViewModels);
            if (userViewModel != null)
            {
                userViewModel.UpdateBalance(amount);
             
            }
        }
    }
  }