There are several ways to convert an integer to a string in C#.PadLeft − Returns a new string of a specified length in which the beginning of the current string is padded with spaces or with a specified Unicode characterToString − Returns a string that represents the current object.String Interpolation − The $ special character identifies a string literal as an interpolated string. This feature is available starting with C# 6.Example using string padding−Example Live Demousing System; namespace DemoApplication{    class Program{       public static void Main(){          int number = 5;         ... Read More

Both Last() and LastOrDefault() will fetch the last occurrence of a value. But the major difference between Last() and LastOrDefault() is that Last() will throw an exception if there is no result data for the supplied criteria whereas LastOrDefault() will return the default value (null) if there is no result data.Use Last() when we knew the sequence will have at least one element. Use LastOrDefault() when we are not sure about the data.Example Live Demousing System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; namespace ConsoleApp {    public class Student {       public int Id { get; set; }   ... Read More

Yield keyword helps to do custom stateful iteration over a collection. Meaning when we use yield keyword the control moves back and forth from the caller function to source and vice versa.Example Live Demousing System; using System.Collections.Generic; namespace DemoApplication {    class Program {       static List numbersList = new List {          1, 2, 3, 4, 5       };       public static void Main() {          foreach(int i in RunningTotal()) {             Console.WriteLine(i);          }          Console.ReadLine(); ... Read More

Generics allows us to define a class with placeholders for the type of its fields, methods, parameters, etc. Generics replace these placeholders with some specific type at compile time. A generic can be defined using angle brackets . A primary limitation of collections is the absence of effective type checking. This means that you can put any object in a collection because all classes in the C# programming language extend from the object base class.Also, we cannot simply return null from a generic method like in normal method. Below is the error that a generic method will throw if we ... Read More

While copying the entire contents of directory, it is more important that we have copy its sub directories and the related files.ExampleLet us consider demo source directory having sub directories and files like below. Below is the demo target directory which is empty initially.using System; using System.IO; namespace DemoApplication {    class Program {       public static void Main() {          string sourceDirectory = @"d:\DemoSourceDirectory";          string targetDirectory = @"d:\DemoTargetDirectory";          DirectoryInfo sourceDircetory = new DirectoryInfo(sourceDirectory);          DirectoryInfo targetDircetory = new DirectoryInfo(targetDirectory);          CopyAll(sourceDircetory, ... Read More

LINQ Except operator comes under Set operators category in LINQThe Except() method requires two collections and finding those elements which are not present in the second collectionExcept for the extension, the method doesn't return the correct result for the collection of complex types.Example using Except() method Live Demousing System; using System.Collections.Generic; using System.Linq; namespace DemoApplication {    class Program {       static void Main(string[] args) {          List animalsList1 = new List {             "tiger", "lion", "dog"          };          Console.WriteLine($"Values in List1:");     ... Read More

Let us take we have to eliminate the line breaks, space and tab space from the below string.eliminate.jpgExampleWe can make use of Replace() extension method of string to do it. Live Demousing System; namespace DemoApplication {    class Program {       static void Main(string[] args) {          string testString = "Hello \r beautiful \t world";          string replacedValue = testString.Replace("\r", "_").Replace("\t", "_");          Console.WriteLine(replacedValue);          Console.ReadLine();       }    } }OutputThe output of the above code isHello _ beautiful _ worldExampleWe can also make use ... Read More

If the collection is a List, then we can make use of ForEach extension method which is available as part of LINQ.Example Live Demousing System; using System.Collections.Generic; namespace DemoApplication {    class Program {       static void Main(string[] args) {          List fruits = new List {             new Fruit {                Name = "Apple",                Size = "Small"             },             new Fruit {         ... Read More

Convert a string representation of number to an integer, using the int.Parse or Convert.ToInt32 method in C#. If the string cannot be converted, then the int.Parse or Convert.ToInt32 method returns an exceptionConvert.ToInt32 allows null value, it doesn't throw any errors Int.parse does not allow null value, and it throws an ArgumentNullException error.Example Live Democlass Program {    static void Main() {       int res;       string myStr = "5000";       res = int.Parse(myStr);       Console.WriteLine("Converting String is a numeric representation: " + res);       Console.ReadLine();    } }OutputConverting String is a ... Read More

For deleting all the folders and its respective directories we can make us System.IO namespace available in C#. The DirectoryInfo() class provides the details of all sub directories and file in a directory.ExampleLet us consider a directory Demo having two sub directories and has some files like below.using System.IO; namespace DemoApplication {    class Program {       static void Main(string[] args) {          DirectoryInfo di = new DirectoryInfo(@"D:\Demo");          foreach (DirectoryInfo dir in di.GetDirectories()) {             foreach (FileInfo file in dir.GetFiles()) {           ... Read More