Алексей Павлов

var filename = Path.GetFileName(s);
File.Move(s, pathA + "\\" + filename);

<ListBox ItemsSource="{Binding DevList}" SelectedItem="{Binding SelectedElement}" />
<GroupBox DataContext="{Binding SelectedElement}">
</GroupBox>
<GroupBox DataContext="{Binding SelectedElement.Subelement1}">
</GroupBox>

namespace DelegateDemo
{
    public delegate string DemoDel(string s);
   
    class Program
    {  
        static void Main(string[] args)
        {
            ParamMethod(DelLink); // передача ссылки на метод DelLink в ParamMethod
            ParamMethod(s => "(" + s + ")"); // передача анонимной функции в ParamMethod
            Console.ReadKey();
        }

        static bool ParamMethod(DemoDel d)
        {
            if(d("что угодно") == "2")
            {
                Console.WriteLine("делегат вернул 2");
            }
            if(d("5") == "(5)" && d("100500") == "(100500)")
            {
                Console.WriteLine("делегат обернул число в скобки");
            }
        }
        static string DelLink(string s)
        {
            return "2";
        }
    }
}

var testFiles = Directory.EnumerateFiles(solutionDirectory + @"\samples");

var sortedTestFiles1 = testFiles.OrderBy(x => x, new NaturalComparer());
// или
var sortedTestFiles2 = testFiles.ToList();
sortedTestFiles2.Sort(new NaturalComparer());

/// <summary>
/// Натуральное сравнение строк
/// </summary>
public class NaturalComparer : IComparer<string>
{
    /// <summary>
    /// Вызов WinApi-функции для натурального сравнения строк
    /// </summary>
    [DllImport("shlwapi.dll", CharSet = CharSet.Unicode)]
    private static extern int StrCmpLogicalW(string psz1, string psz2);

    /// <summary>
    /// Натуральное сравнение строк
    /// </summary>
    /// <param name="x">Первая строка</param>
    /// <param name="y">Вторая строка</param>
    /// <returns>Сравнивает две строки, возвращая -1, 0 или 1</returns>
    public static int Compare(string x, string y)
    {
        return StrCmpLogicalW(x, y);
    }

    /// <summary>
    /// Натуральное сравнение строк
    /// </summary>
    /// <param name="x">Первая строка</param>
    /// <param name="y">Вторая строка</param>
    /// <returns>Сравнивает две строки, возвращая -1, 0 или 1</returns>
    int IComparer<string>.Compare(string x, string y)
    {
        return StrCmpLogicalW(x, y);
    }
}

public void Print(string str)
{
      Console.WriteLine(string.Format("{0} {1} Ok!", DateTime.Now, str));
}

return (from e in db.Position
    .Include(p => p.Operations.Select(o => o.Transition.Select(t => t.RiggingTransition)))
    .Include(p => p.Operations.Select(o => o.MaterialOperation))
    where ...
    select e).ToList();

class TestClass
{
    private int _a;
    public int A
    {
        get { return _a; }
        set { _a = value; }
    }

    public int B { get; set; }
}

var testClass = typeof(TestClass);
var fields = testClass.GetFields(BindingFlags.NonPublic | BindingFlags.Instance);
foreach (var fieldInfo in fields)
{
    Console.WriteLine(fieldInfo.Name);
}
// результат:
// _a
// <B>k__BackingField

class A { public virtual void Print() { Console.WriteLine("A"); } }
class B : A { public override void Print() { Console.WriteLine("B"); } }
class C : B { public new virtual void Print() { Console.WriteLine("C"); } }
class D : C { public override void Print() { Console.WriteLine("D"); } }

A ad = new D();
ad.Print(); // покажет B

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;
    }
}