Use the Contains() method to check whether a node is a LinkedList or not.Here is our LinkedList.string [] students = {"Beth", "Jennifer", "Amy", "Vera"}; LinkedList list = new LinkedList(students);Now, to check whether the node “Amy” is in the list or not, we will use the Contains() method as shown below ... Read More

In a Linked List, if you want to add a node at the first position, use AddFirst method.Let’s first set a LinkedList.string [] students = {"Jenifer", "Angelina", "Vera"}; LinkedList list = new LinkedList(students);Now, to add an element as a first node, use AddFirst() method.List.AddFirst(“Natalie”);Example Live Demousing System; using System.Collections.Generic; class Demo ... Read More

Declare a LinkedList and add nodes to it.string [] students = {"Tim", "Jack", "Henry", "David", "Tom"}; LinkedList list = new LinkedList(students);Let us add a new node.var newNode = list.AddLast("Kevin");Now, to add a node before the given node, use the AddBefore() method.list.AddBefore(newNode, "Matt");Let us now see the complete code.Example Live Demousing System; ... Read More

Firstly, set a string array.string [] students = {"Tim", "Jack", "Henry", "David", "Tom"};Now, add it to the LinkedList.LinkedList list = new LinkedList(students);The above creates a LinkedList and adds node to it.Let us see the complete example.Example Live Demousing System; using System.Collections.Generic; class Demo {    static void Main() {     ... Read More

Use the TakeLast() method to return elements from the end of an array.Let us first declare and initialize an array.int[] prod = { 110, 290, 340, 540, 456, 698, 765, 789};Now, let’s get the last three elements.IEnumerable units = prod.AsQueryable().TakeLast(3);Let us see the complete code.Example Live Demousing System; using System.Linq; using ... Read More

Use the AsEnumerable() method to cast a type to its IEnumerable equivalent. It is an extension method.For our example, we have set an array.int[] myArr = new int[10]; myArr[0] = 1; myArr[1] = 2; myArr[2] = 3; myArr[3] = 4; myArr[4] = 5;Now, we have used the AsEnumerable() method to ... Read More

This method returns true if the entered string has only whitespace characters or is null.Let’s say you are checking for whitespace character.bool val1 = string.IsNullOrWhiteSpace(“ “);The above returns True, since the string is a whitespace character. In the same way, check it for null using the IsNullOrWhiteSpace() method.Here is the ... Read More

Filter a collection on the basis of each of its elements type.Let’s say you have the following list with integer and string elements −list.Add("Katie"); list.Add(100); list.Add(200);To filter collection and get only elements with string type.var myStr = from a in list.OfType() select a;Work the same for integer type.var myInt = ... Read More

The Month standard format specifier represents a custom date and time format string.The format string is defined by the current DateTimeFormatInfo.MonthDayPattern property.The custom format string −MMMM ddExample Live Demousing System; using System.Globalization; class Demo {    static void Main() {       DateTime date = new DateTime(2018, 6, 11, 9, ... Read More

The f is a lowercase suffix set while declaring a float. It tells the compiler that the literal is of a specific type.Example Live Demousing System.IO; using System; public class Program {    public static void Main() {       float val = 30.22f;       Console.WriteLine(val);    } ... Read More