new/ViewModels/MainWindowViewModel.cs

using YtYtAvalonia.Models;
using YtYtAvalonia.Views;
using YtYtAvalonia.ViewModels;

namespace YtYtAvalonia.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
#pragma warning disable CA1822 // Mark members as static

        public static SuharevaContext myConnection = new SuharevaContext();

        RegistrationViewModel regPage = new RegistrationViewModel(myConnection);
        public RegistrationViewModel RegPage { get => regPage; set => regPage = value; }

#pragma warning restore CA1822 // Mark members as static
    }
}