test/QualTask/UserWindow.axaml.cs

using System.Linq;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;

namespace QualTask;

public partial class UserWindow : Window
{
    public UserWindow()
    {
        InitializeComponent();
        UsersDataGrid.Items = DbService.GetContext().Users.ToList();
    }
}