Михаил Усоцкий

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter your name: ");
            string name = Console.ReadLine();
            char[] charArr = name.ToCharArray();

            Array.Reverse(charArr);
            string reName = string.Join("",charArr);
            Console.WriteLine(reName);
            Console.ReadKey();
        }
    }

public class Item : BaseViewModel
{
    private string _name;
    public string Name 
    { 
        get => _name;
        set
        {
            _name = value;
            RaisePropertyChanged();
        }
    }
    
    private int _itemMode;
    public int ItemMode 
    { 
        get => _itemMode;
        set
        {
            _itemMode = value;
            RaisePropertyChanged();
        }
    }
}

public class ItemsList
{
    public ObservableCollection<Item> Items { get; } = new ObservableCollection<Item>
    {
        new Item { Name = "Один", ItemMode = 1 },
        new Item { Name = "Два", ItemMode = 2 },
        new Item { Name = "Три", ItemMode = 3 },
    };
}

<Grid>
    <Grid.Resources>
        <converters:IntToBoolConverter x:Key="IntToBoolConverter"/>
        <DataTemplate DataType="{x:Type viewModels:Item}">
            <Border x:Name="Data">
                <Grid x:Name="ContentBase" Margin="1,0">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                        <ColumnDefinition/>
                    </Grid.ColumnDefinitions>
                    <Label Name="DisplayText" Grid.Column="0" Content="{Binding Name}"/>
                    <RadioButton Name="_1" Grid.Column="1" Content="1" 
                                 IsChecked="{Binding ItemMode, Converter={StaticResource IntToBoolConverter}, ConverterParameter=1}"/>
                    <RadioButton Name="_2" Grid.Column="2" Content="2" 
                                 IsChecked="{Binding ItemMode, Converter={StaticResource IntToBoolConverter}, ConverterParameter=2}"/>
                    <RadioButton Name="_3" Grid.Column="3" Content="3" 
                                 IsChecked="{Binding ItemMode, Converter={StaticResource IntToBoolConverter}, ConverterParameter=3}"/>
                </Grid>
            </Border>
        </DataTemplate>
    </Grid.Resources>        
    <Grid.DataContext>
        <viewModels:ItemsList/>
    </Grid.DataContext>
    <ListBox ItemsSource="{Binding Items}"/>
</Grid>

public class BaseViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    
    protected virtual void RaisePropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class IntToBooleanConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value != null 
            && parameter != null 
            && value.ToString() == parameter.ToString();
    }
 
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null || parameter == null) return Binding.DoNothing;

        int result;
        if ((bool)value && int.TryParse(parameter.ToString(), out result))
        {
            return result;
        }

        return Binding.DoNothing;
    }
}

string bla = "первое слово";
string bla2 = "второе слово";
textBox1.Text = string.Format($"({bla}, {bla2})"); //знак $ нужен для того, чтобы сказать, что тут именованные переменные нужно брать

private DispatcherTimer timer = null;
private int x;

private void timerStart () {
            timer = new DispatcherTimer();  // если надо, то в скобках указываем приоритет, например DispatcherPriority.Render
            timer.Tick += new EventHandler(timerTick);
            timer.Interval = new TimeSpan(0, 0, 0, 0, 500);
            timer.Start();
}

private void timerTick(object sender, EventArgs e)
{
            x++;
}