Use ThenBy() method to order array elements. Let’s say we have the following string array.string[] str = { "Sandler", "Jack", "Tom", "Matt", "Henry", "Johnny" };Now, use Lambda Expressions and set a condition inside the ThenBy() method to sort the strings according to the number of characters they have.IEnumerable res = str.AsQueryable().OrderBy(alp => alp.Length).ThenBy(alp => alp);Here is the entire example to order array elements using ThenBy() method.Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       string[] str = { "Sandler", "Jack", "Tom", "Matt", "Henry", "Johnny" };       IEnumerable ... Read More

To reprsent Int64 as a Octal string in C#, use the ToString() method and set the base as the ToString() method’s second parameter i.e. 8 for Octal.Int64 represents a 64-bit signed integer.Firstly, set an Int64 variable.long val = 986766;Now, convert it to octal string by including 8 as the second parameter.Convert.ToString(val, 8)Example Live Demousing System; class Demo {    static void Main() {       long val = 986766;       Console.WriteLine("Long: "+val);       Console.Write("Octal String: "+Convert.ToString(val, 8));    } }OutputLong: 986766 Octal String: 3607216

Get elements as long as the condition is true in a sequence using the TakeWhile() method.The following is our list with strings.IList str = new List(){ "Car", "Bus", "Truck", "Airplane"};Now, let’s say we need the strings whose length is less than 4. For that, use Lambda Expressions and add it as a condition in the TakeWhile() method.str.TakeWhile(a => a.Length < 4);Here is the example that displays elements until the condition is trie.Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       IList str = new List(){ "Car", "Bus", "Truck", "Airplane"}; ... Read More

Get specified number of elements from the end using the TakeLast() method.The following is our array.int[] pages = { 492, 290, 129, 602, 152 };Now, use OrderBy to order the elements in ascending order. Then use the TakeLast() method to get specified number of elements from the end.marks.AsQueryable().OrderByDescending(s => s).Take(5);Let us see the complete example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       // pages of books       int[] pages = { 492, 290, 129, 602, 152 };       // get pages of last two ... Read More

Get specified number of elements from the beginning using the Take() method.The following is our array.int[] marks = { 35, 72, 50, 90, 95, 85, 52, 67 };Now, use OrderByDescending to order the elements in Descending order. Then use the Take() method to get the elements.marks.AsQueryable().OrderByDescending(s => s).Take(5);Let us see the complete example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       int[] marks = { 35, 72, 50, 90, 95, 85, 52, 67 };       // top 5 student marks       IEnumerable selMarks = marks.AsQueryable().OrderByDescending(s => s).Take(5);       foreach (int res in selMarks) {          Console.WriteLine(res);       }    } }Output95 90 85 72 67

Firstly, set a sequence.List myList = new List { 1, 2, 3, 4 ,5};Now find the sum using the Queryable Sum() method.myList.AsQueryable().Sum();Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       List myList = new List { 1, 2, 3, 4 ,5};       Console.WriteLine("Sum of elements in a list...");       foreach (int res in myList) {          Console.WriteLine(res);       }       int sum = myList.AsQueryable().Sum();       Console.WriteLine("Sum = {0}", sum);    } }OutputSum of elements in a list... 1 2 3 4 5 Sum = 15

Find the sum of elements using the Linq Sum() method.Here’s our list with integer elements.List list = new List { 99, 34, 77, 75, 87, 35, 88};Now find the sum using the Sum() method.list.AsQueryable().Sum();The following is an example to find the sum of elements of a list with integer elements.Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       List list = new List { 99, 34, 77, 75, 87, 35, 88};       int res = list.AsQueryable().Sum();       Console.WriteLine("Sum = {0}", res);    } }OutputSum = 495

Set two sequences.double[] arr1 = { 10.2, 15.6, 23.3, 30.5, 50.2 }; double[] arr2 = { 15.6, 30.5, 50.2 };To get the difference between both the above arrays, use Except() method.IEnumerable res = arr1.AsQueryable().Except(arr2);The following is the complete code.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo {    static void Main() {       double[] arr1 = { 10.2, 15.6, 23.3, 30.5, 50.2 };       double[] arr2 = { 15.6, 30.5, 50.2 };       Console.WriteLine("Initial List...");       foreach(double ele in arr1) {          Console.WriteLine(ele);       }       IEnumerable res = arr1.AsQueryable().Except(arr2);       Console.WriteLine("New List...");       foreach (double a in res) {          Console.WriteLine(a);       }    } }OutputInitial List... 10.2 15.6 23.3 30.5 50.2 New List... 10.2 23.3

The TryParse() method converts the string representation of one or more enumerated constants to an equivalent enumerated object.Firstly, set an enum.enum Vehicle { Bus = 2, Truck = 4, Car = 10 };Now, let us declare a string array and set some values.string[] VehicleList = { "2", "3", "4", "bus", "Truck", "CAR" };Now parse the values accordingly using Enum TryParse() method.Example Live Demousing System; public class Demo {    enum Vehicle { Bus = 2, Truck = 4, Car = 10 };    public static void Main() {       string[] VehicleList = { "2", "3", "4", "bus", "Truck", "CAR" ... Read More

Bypass elements in an array and return the remaining elements using the SkipWhile() method.The following is our array −int[] marks = { 45, 88, 55, 90, 95, 85 };Now, let’s skip the elements greater than or equal to 60. The condition we have set using Lambda Expression.IEnumerable selMarks = marks.AsQueryable().OrderByDescending(s => s).SkipWhile(s => s >= 60);Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo {    public static void Main() {       int[] marks = { 45, 88, 55, 90, 95, 85 };       // skips elements above 60       IEnumerable selMarks = ... Read More