ViewModels/LoginViewModel.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Security;
using System.Security.Principal;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Input;
using WPF_LoginForm.Models;
using WPF_LoginForm.Repositories;

namespace WPF_LoginForm.ViewModels
{
    public class LoginViewModel : ViewModelBase
    {
        //Fields
        private string _username;
        private SecureString _password;
        private string _errorMessage;
        private bool _isViewVisible = true;

        private IUserRepository userRepository;

        //Properties
        public string Username
        {
            get
            {
                return _username;
            }

            set
            {
                _username = value;
                OnPropertyChanged(nameof(Username));
            }
        }

        public SecureString Password
        {
            get
            {
                return _password;
            }

            set
            {
                _password = value;
                OnPropertyChanged(nameof(Password));
            }
        }

        public string ErrorMessage
        {
            get
            {
                return _errorMessage;
            }