using System;using System.Text.RegularExpressions;namespace RegExApplication {class Program {static void Main(string[] args) {

using System;using System.IO;namespace BinaryFileApplication {class Program {static void Main(string[] args) {

#define DEBUGusing System;using System.Diagnostics;public class Myclass {[Conditional(DEBUG)]

using System;using System.Reflection;namespace BugFixApplication {//a custom attribute BugFix to be//assigned to a class and its members

using System;namespace yiibai {class Student {private string code = N.A;private string name = not known;

using System;namespace BoxApplication {class Box {public double length;// Length of a boxpublic double breadth;// Breadth of a box

using System;struct Books {private string title;private string author;private string subject;private int book_id;

using System;struct Books {public string title;public string author;public string subject;public int book_id;

using System;namespace BoxApplication {class Box {private double length;// Length of a boxprivate double breadth;// Breadth of a box

using System;namespace LineApplication {class Line {private double length;// Length of a linepublic Line() {

using System;namespace LineApplication {class Line {private double length;// Length of a linepublic Line(double len) {//Parameterized constructor

using System;namespace StaticVarApplication {class StaticVar {public static int num;public void count() {

using System;namespace InheritanceApplication {class Shape {public void setWidth(int w) {width = w;}public void setHeight(int h) {

using System;using first_space;using second_space;namespace first_space {class abc {public void func() {

using System;using first_space;using first_space.second_space;namespace first_space {class abc {public void func() {

#define DEBUG#define VC_V10using System;public class TestClass {public static void Main() {#if (DEBUG !VC_V10)

using System;using System.Text.RegularExpressions;namespace RegExApplication {class Program {private static void showMatch(string text, string expr) {

using System;using System.IO;namespace FileApplication {class Program {static void Main(string[] args) {

using System;using System.IO;namespace FileIOApplication {class Program {static void Main(string[] args) {

using System;namespace UserDefinedException {class TestTemperature {static void Main(string[] args) {