Program Structure II

Value: stack, System.ValueType

out: needn't initial before use.

Should be initial before use ref. Memory: managed heap

params : dynamical array.

overload method(in a class)

Rectangle array and staggered multiple dimension array

System.Array

Clear()

Copyto()

Get Enumerator()

Length

Rank

Reverse()

Sort()

Enumeration(int, byte, short, int or long)

enum EmpType: byte

{

  Manager=10,

  Grunt=1,

  Contractor=100,

  VicePresident=9

}

EmpType emp=EmpType.Contractor;

System.Enum

Enum.GetUnderlyingType(typeof(EmpType))

        static void Main(string[] args)

        {

            ConsoleColor cc=ConsoleColor.Red;

            Enum e=cc;

            Array enumData = Enum.GetValues(e.GetType());

            for (int i = 0; i < enumData.Length; i++)

                Console.WriteLine("Name:{0}, Value:{0:D}",enumData.GetValue(i));

            Console.ReadLine();

        }

struct

class

System.Nullable<T> sa= new T?();

            int? x = null;

            int? y = 200;

            int? i = x ?? 100;

            int? j = y ?? 100;

            Console.WriteLine("{0}", i.Value);

            Console.WriteLine("{0}", j.Value);

            Console.ReadLine();