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

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

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

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

using System; namespace EnumApplication { class EnumProgram { enum Days { Sun, Mon, tue, Wed, thu, Fri, Sat };

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 yiibai { class Student { private string code = "N.A"; private string name = "not known";

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

using System; public class MyClass { [Obsolete("Don't use OldMethod, use NewMethod instead", true)]

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

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

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) {

using System; namespace ErrorHandlingApplication { class DivNumbers { int result; DivNumbers() { result = 0;

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

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

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

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

#define PI using System; namespace PreprocessorDAppl { class Program { static void Main(string[] args) {

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

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

using System; namespace first_space { class namespace_cl { public void func() { Console.WriteLine("Inside first_space");

using System.Collections.Generic; using System.Linq; using System.Text; using System; namespace InterfaceApplication {

using System; namespace UnsafeCodeApplication { class Program { static unsafe void Main(string[] args) {

using System; delegate void NumberChanger(int n); namespace DelegateAppl { class TestDelegate { static int num = 10;

using System; using System.Collections.Generic; delegate T NumberChanger<T>(T n); namespace GenericDelegateAppl {

using System; using System.Collections.Generic; namespace GenericMethodAppl { class Program { static void Swap<T>(ref T lhs, ref T rhs) {

using System; using System.Collections.Generic; namespace GenericApplication { public class MyGenericArray<T> {