❔ MVVM

 public class MainViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        public User? user;
        
        public ICommand ShowUsersCommand { get; set; }

        public MainViewModel()
        {
            ShowUsersCommand = new RelayCommand(ShowUsers, CanShowUsers);
        }

        private void ShowUsers(object obj)
        {
            user = new User().GetUsers()[0];
            NotifyPropertyChanged("User");
        }

        private bool CanShowUsers(object parameter)
        {
            return true;
        }

        private void NotifyPropertyChanged(string propery)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propery));
        }
    }

 public class MainViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        public User? user;
        
        public ICommand ShowUsersCommand { get; set; }

        public MainViewModel()
        {
            ShowUsersCommand = new RelayCommand(ShowUsers, CanShowUsers);
        }

        private void ShowUsers(object obj)
        {
            user = new User().GetUsers()[0];
            NotifyPropertyChanged("User");
        }

        private bool CanShowUsers(object parameter)
        {
            return true;
        }

        private void NotifyPropertyChanged(string propery)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propery));
        }
    }

<StackPanel>
        <StackPanel Margin="5" Orientation="Horizontal">
            <TextBlock Text="Id: "/>
            <TextBlock Text="{Binding User.Id}"/>
        </StackPanel>

        <StackPanel Margin="5" Orientation="Horizontal">
            <TextBlock Text="Name: "/>
            <TextBlock Text="{Binding User.Name}"/>
        </StackPanel>
        
        <StackPanel Margin="5" Orientation="Horizontal">
            <TextBlock Text="Email: "/>
            <TextBlock Text="{Binding User.Email}"/>
        </StackPanel>
        <Button Command="{Binding ShowUsersCommand}" Content="Get Users"/>
    </StackPanel>

<StackPanel>
        <StackPanel Margin="5" Orientation="Horizontal">
            <TextBlock Text="Id: "/>
            <TextBlock Text="{Binding User.Id}"/>
        </StackPanel>

        <StackPanel Margin="5" Orientation="Horizontal">
            <TextBlock Text="Name: "/>
            <TextBlock Text="{Binding User.Name}"/>
        </StackPanel>
        
        <StackPanel Margin="5" Orientation="Horizontal">
            <TextBlock Text="Email: "/>
            <TextBlock Text="{Binding User.Email}"/>
        </StackPanel>
        <Button Command="{Binding ShowUsersCommand}" Content="Get Users"/>
    </StackPanel>

public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
        }
    }

public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
        }
    }

System.Windows.Data Error: 40 : BindingExpression path error: 'User' property not found on 'object' ''MainViewModel' (HashCode=38376892)'. BindingExpression:Path=User.Id; DataItem='MainViewModel' (HashCode=38376892); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')

System.Windows.Data Error: 40 : BindingExpression path error: 'User' property not found on 'object' ''MainViewModel' (HashCode=38376892)'. BindingExpression:Path=User.Id; DataItem='MainViewModel' (HashCode=38376892); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')

 public class MainViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        public User? User;

 public class MainViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        public User? User;

 [ObservableProperty]
        public User? user;

 [ObservableProperty]
        public User? user;

System.Windows.Data Error: 40 : BindingExpression path error: 'user' property not found on 'object' ''MainViewModel' (HashCode=21520579)'. BindingExpression:Path=user.Id; DataItem='MainViewModel' (HashCode=21520579); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')

System.Windows.Data Error: 40 : BindingExpression path error: 'user' property not found on 'object' ''MainViewModel' (HashCode=21520579)'. BindingExpression:Path=user.Id; DataItem='MainViewModel' (HashCode=21520579); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')