Firstly, declare and initialize two arrays −int[] arr1 = { 37, 45, 65 }; int[] arr2 = { 70, 89, 118 };Now create a new list −var myList = new List(); myList.AddRange(arr1); myList.AddRange(arr2);Use the AddRange() method the arrays into the newly created list.myList.AddRange(arr1); myList.AddRange(arr2);Now convert the list into array as shown below −Example Live Demousing System; using System.Collections.Generic; class Demo {    static void Main() {       int[] arr1 = { 37, 45, 65 };       int[] arr2 = { 70, 89, 118 };       // displaying array1       Console.WriteLine("Array 1...");     ... Read More

NullReferenceException occurs when you try to to access member fields, or function types that points to null.Here is an example −Example Live Demousing System; class Demo {    static void Main() {       string str = null;       if (str.Length > 0) {          Console.WriteLine(str);       }    } }OutputThe following is the output. It throws NullReferenceException, since you are tryonhg access a memebt that points to null −Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object at Demo.Main () [0x00002] in :0 [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object at Demo.Main () [0x00002] in :0

It gets an array of the names of constants in an enumeration. The following is the syntax −Enum.GetNames(Type)Here, Type is an enumeration type.The following is an example −Example Live Demousing System; class Demo {    enum Vehicle {       Car,       Motorbike,       Truck,    };    static void Main() {       // display the enum       foreach ( string res in Enum.GetNames ( typeof (Vehicle)))       Console.WriteLine (res);    } }OutputCar Motorbike Truck

Gets the string representation of an Enum value using the Enum.GetName.It has two parameters −Type − Enumeration typeObject − Value of an enumerationThe following is an example −Example Live Demousing System; class Demo {    enum Vehicle {       Car,       Motorbike,       Truck,       Bicycles    };    static void Main() {       // Usig GetName to get the string representation of enum type       string res = Enum.GetName(typeof(Vehicle), Vehicle.Motorbike);           // Displaying       Console.WriteLine(res);    } }OutputMotorbike

The nameof operator returns a string literal of an element that can be a variable, type or member.For example, the following is our variable −var vehicle = "motorbike";To get the string literal, use nameof −nameof(vehicle);The following is the code to implement nameof keyword −Example Live Demousing System; public class Program {    static void Main() {       var vehicle = "motorbike";       Console.WriteLine(nameof(vehicle));       var time = DateTime.Now.ToLocalTime();       Console.WriteLine(nameof(time));       var a = false;       Console.WriteLine(nameof(a));    } }Outputvehicle time a

Use the default operator to get the default value of bool type −bool a = default(bool);Above, we have used the default keyword to get the default value.Let us see the code to display default value of bool −Example Live Demousing System; public class Demo {    public static void Main() {       bool a = default(bool);       // default for bool       Console.WriteLine("Default for bool type = "+a);    } }OutputThe following is the output. It shows a blank space i.e. False.Default for bool type = False

Use the default operator to get the default value of StringBuilder.StringBuilder str = default(StringBuilder);Above, we have used the default keywords to get the default value.Let us see the complete code −Example Live Demousing System; using System.Text; public class Demo {    public static void Main() {       StringBuilder str = default(StringBuilder);       Console.WriteLine("Default for StringBuilder = "+str);    } }OutputDefault for StringBuilder =The following is the output. It shows a blank space i.e. Null.Default for StringBuilder = Null

Using the default, you can get the default value of every reference and value type. The expressions set as default are evaluated at compile-time.To get the default for int −default(int);To get the default for long −default(long)Let us see the code to display default values −Example Live Demousing System; public class Demo {    public static void Main() {       int val1 = default(int);       long val2 = default(long);       bool val3 = default(bool);       // default for int       Console.WriteLine(val1);       // default for long       Console.WriteLine(val2);       // default for bol       Console.WriteLine(val3);    } }Output0 0 False

In a bool array, you can store true and false values. To set a bool array, use the new operator −bool[] arr = new bool[5];To add elements in the array −arr[0] = true; arr[1] = true; arr[2] = false; arr[3] = true; arr[4] = true;Let us see the complete code −Example Live Demousing System; public class Demo {    public static void Main() {       bool[] arr = new bool[5];       arr[0] = true;       arr[1] = true;       arr[2] = false;       arr[3] = true;       arr[4] = true;       Console.WriteLine("Displaying values...");       foreach (bool res in arr) {          Console.WriteLine(res);       }    } }OutputDisplaying values... True True False True True

The following is the string array −string[] str = { "Java", "AngularJS", "Python", "jQuery", "HTML5" };Firstly, join it −string.Join(" ", str);Now to separate the above joined strings, use the Split() method as shown in the following code −Example Live Demousing System; public class Demo {    public static void Main() {       string[] str = { "Java", "AngularJS", "Python", "jQuery", "HTML5" };       // join words       string res = string.Join(" ", str);       Console.WriteLine("Joined Strings... "+res);       string[] convert = res.Split(' ');       Console.WriteLine("Separate Joined Strings..."); ... Read More