Си шарп с нуля

Если уже перечислять, то все и красива)))

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DataTypes
{
class MyDataType
{
public string Show()
{
return ("MyType");
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("VALUE TYPE:");
Console.WriteLine("---------------------------------------------");
Console.WriteLine("Integers:");
byte a = 12;
Console.WriteLine("byte\tA = {0}\t{1}\t{2}\t{3}", a, typeof(byte), byte.MaxValue, byte.MinValue);
sbyte b = 12;
Console.WriteLine("sbyte\tB = {0}\t{1}\t{2}\t{3}", b, typeof(sbyte), sbyte.MaxValue, sbyte.MinValue);
short c = 12;
Console.WriteLine("short\tC = {0}\t{1}\t{2}\t{3}", c, typeof(short), short.MaxValue, short.MinValue);
ushort d = 12;
Console.WriteLine("ushort\tD = {0}\t{1}\t{2}\t{3}", d, typeof(ushort), ushort.MaxValue, ushort.MinValue);
int e = 12;
Console.WriteLine("int\tE = {0}\t{1}\t{2}\t{3}", e, typeof(int), int.MaxValue, int.MinValue);
uint f = 12;
Console.WriteLine("unit\tF = {0}\t{1}\t{2}\t{3}", f, typeof(uint), uint.MaxValue, uint.MinValue);
long g = 12;
Console.WriteLine("long\tG = {0}\t{1}\t{2}\t{3}", g, typeof(long), long.MaxValue, long.MinValue);
ulong h = 12;
Console.WriteLine("ulong\tH = {0}\t{1}\t{2}\t{3}", h, typeof(ulong), ulong.MaxValue, ulong.MinValue);

Console.WriteLine("\nFloating Point:");
float i = 123.34f;
Console.WriteLine("float\tI = {0}\t{1}\t{2}\t{3}", i, typeof(float), float.MaxValue, float.MinValue);
double j = 123.34;
Console.WriteLine("double\tJ = {0}\t{1}\t{2}\t{3}", j, typeof(double), double.MaxValue, double.MinValue);
decimal k = 123.34m;
Console.WriteLine("decimal\tK = {0}\t{1}\t{2}\t{3}", k, typeof(decimal), decimal.MaxValue, decimal.MinValue);

Console.WriteLine("\nText:");
char l = 'f';
Console.WriteLine("char\tL = {0}\t{1}", l, typeof(char));

Console.WriteLine("\nBoolean:");
bool m = true;
Console.WriteLine("bool\tM = {0}\t{1}", m, typeof(bool));

Console.WriteLine("\nREFERENCE TYPE:");
Console.WriteLine("---------------------------------------------");
string n = "Hello";
Console.WriteLine("string\tn = {0}\t{1}", n, typeof(string));
object o = 12.34;
Console.WriteLine("object\tn = {0}\t{1}", o, typeof(object));
MyDataType p = new MyDataType();
Console.WriteLine("MyDataType\tp = {0}\t{1}", p.Show(), typeof(MyDataType));
int[] q = { 12, 45, 56 };
Console.WriteLine("int[]\tq = {0}",typeof(int[]));

Console.WriteLine("\nNullable TYPE:");
Console.WriteLine("---------------------------------------------");
string r = null;
Console.WriteLine("string\tr = {0}\t{1}", r, typeof(string));
int? s = null;
Console.WriteLine("int\ts = {0}\t{1}", s, typeof(int?));

Console.ReadKey();
}
}
}

string[] text = new string[] { "One", "Two", "Three", "Four", "Five"};
        foreach (string t in text)
      {
          Console.WriteLine(t);

int a = 12;
        int b = 25;
        int c = 689;
        int d = 60;
        int e = 9;
        int f = 3;

        int x1 = ((b + c) / (d - e));
        int x2 = ((a * x1) - (a * f));

        Console.WriteLine(x2);

В visual studio 132, а здесь ответ не выводится ))))

В самом тексте "Hello World" забыл добавить "!" знак и выдавала ошибку, будьте внимательны.