using System;namespace HelloWorldApplication {class HelloWorld {static void Main(string[] args) {/* my first program in C# */

using System;namespace CalculatorApplication {class NumberManipulator {public int FindMax(int num1, int num2) {

using System;namespace RectangleApplication {class Rectangle {//member variablesinternal double length;

namespace RectangleApplication {class Rectangle {//member variablespublic double length;public double width;

using System;namespace TypeConversionApplication {class StringConversion {static void Main(string[] args) {

using System;namespace TypeConversionApplication {class ExplicitConversion {static void Main(string[] args) {

using System;namespace RectangleApplication {class Rectangle {// member variablesdouble length;double width;

using System;namespace EscapeChar {class Program {static void Main(string[] args) {Console.WriteLine(Hello\\tWorld\\n\\n);

using System;namespace DeclaringConstants {class Program {static void Main(string[] args) {const double pi = 3.14159;

using System;class Program {static void Main(string[] args) {int a = 21;int b = 10;if (a == b) {Console.WriteLine(Line 1 - a is equal to b);

using System;namespace VariableDefinition {class Program {static void Main(string[] args) {short a;int b ;

using System;namespace OperatorsAppl {class Program {static void Main(string[] args) {bool a = true;

using System;namespace BubbleSort {class MySort {static void Main(string[] args) {int[] arr = { 78, 55, 45, 98, 13 };

using System;namespace UnsafeCodeApplication {class Program {public static void Main() {unsafe {int var = 20;

using System;using System.Collections.Generic;using System.Linq;using System.Text.RegularExpressions;

using System;public class Demo {public static void Main() {string str1 = United, str2 = Uni;

using System;namespace UnsafeCodeApplication {class TestPointer {public unsafe static void Main() {int[]list = {10, 100, 200};

using System;using System.Threading;namespace MultithreadingApplication {class MainThreadProgram {static void Main(string[] args) {

using System;using System.Threading;namespace MultithreadingApplication {class ThreadCreationProgram {

using System;using System.Threading;namespace MultithreadingApplication {class ThreadCreationProgram {