public ActionResult Index()
{
    return View();
}

string str = 'Hello';
string str2 = str;
str2 += ' World';
Console.WriteLine(str);

List numbers = new List {1, 2, 3, 4, 5};
numbers.RemoveRange(1, 3);

public class Worker
{
    public void DoWork()
    {
        for (int i = 0; i < 5; i++)
        {
            Thread.Sleep(1000);
            Console.WriteLine('Working...');
        }
    }
}

Thread workerThread = new Thread(new Worker().DoWork);
workerThread.Start();

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

Person person = new Person { Name = 'John', Age = 30 };

public class Test
{
    public int X { get; set; }
    public int Y { get; set; }
}

Test t1 = new Test { X = 10, Y = 20 };
Test t2 = t1;
t2.X = 30;
Console.WriteLine(t1.X);