The following is our array −double[] myArr = {20.5, 35.6, 45.7, 55.6, 79.7};To get the first element, use the First() method.myArr.AsQueryable().First();Let us see the complete code −Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo {    static void Main() {       double[] myArr = {20.5, 35.6, 45.7, ... Read More

Enumerable.Repeat method is part of System.Linq namespace.It returns a collection with repeated elements in C#.Firstly, set which element you want to repeat and how many times.As an example, let us see how to repeat number 10, five times −Enumerable.Repeat(10, 5);The following is the complete example −Example Live Demousing System; using System.Linq; ... Read More

Here is the string.string str = "ppqqrr";Now, use Hashset to map the string to char. This will remove the duplicate characters from a string.var res = new HashSet(str);Let us see the complete example −Example Live Demousing System; using System.Linq; using System.Collections.Generic; namespace Demo {    class Program {       ... Read More

With C# 7, you can easily create a ValueType with names.Note − Add System.ValueTuple package to run ValueTuple program.Let’s see how to add it −Go to your projectRight click on the project in the solution explorerSelect “Manage NuGet Packages”You will reach the NuGet Package Manager.Now, click the Browse tab and ... Read More

Set a list.List myList = new List(){1, 2, 3, 5, 8, 9};Now, get the first and last elements −int a = myList.OrderBy(x => x).First(); int b = myList.OrderBy(x => x).Last();In a new list, get all the elements and use the Except to get the missing numbers −List myList2 = Enumerable.Range(a, ... Read More

Use the Environment.ProcessorCount to get the total number of cores on a computer −Environment.ProcessorCountThe following is the code that displays the total number of cores on a computer in C# −ExampleUsing System; namespace Demo {    class Program {       static void Main(string[] args) {          Console.WriteLine(Environment.ProcessorCount);       }    } }

The Func generic type store anonymous methods and is a parameterized type.In the below example, we have 4 func type instance −The first type receives int and returns stringFunc one = (p) => string.Format("{0}", p);The second type receives bool & long and returns stringFunc two = (q, p) =>string.Format("{0} and ... Read More

Firstly, set Random class −Random random = new Random();Set a range under the Next() method. This displays a letter between 0 and 26.int a = random.Next(0, 26);Here is the complete code −Example Live Demousing System; using System.IO; using System.Linq; class Demo {    static void Main() {       Random ... Read More

The SequenceEqual method is used to test collections for equality.Let us set three string arrays −string[] arr1 = { "This", "is", "it" }; string[] arr2 = { "My", "work", "report" }; string[] arr3 = { "This", "is", "it" };Now, compare the first array with the second using the SequenceEqual() method ... Read More

Let’s say the following is the number −int a = 12250;You can work around the following ways to get a number in hexadecimal format −{0:x} {0:x8} {0:X} {0:X8}Here is the code −Example Live Demousing System; class Demo {    static void Main() {       int a = 12250;   ... Read More