What are collection classes in C#?

Collection classes have various uses, such as dynamically allocating memory to elements, accessing a list of items based on index, etc.

The following are the classes in Collections:

Serial number	Category and description and usage
1	ArrayList It represents an ordered collection of objects that can be individually indexed.
2	Hashtable It uses keys to access elements in the collection.
3	SortedList It uses keys and indexes to access items in the list.
4	Stack It represents a last-in-first-out collection of objects.
5	Queue It represents a first-in, first-out collection of objects.
6	BitArray It represents an array using binary representation of values ​​1 and 0 .

Let’s look at an example of the BitArray class in C#:

Example

Online Demo

using System;
using System.Collections;

namespace CollectionsApplication {
   class Program {
      static void Main(string[] args) {
         //creating two bit arrays of size 8
         BitArray ba1 = new BitArray(8);
         BitArray ba2 = new BitArray(8);

         byte[] a = { 60 };
         byte[] b = { 13 };

         //storing the values 60, and 13 into the bit arrays
         ba1 = new BitArray(a);
         ba2 = new BitArray(b);

         //content of ba1
         Console.WriteLine("Bit array ba1: 60");

         for (int i = 0; i < ba1.Count; i++) {
            Console.Write("{0, -6} ", ba1[i]);
         }
   
         Console.WriteLine();

         //content of ba2
         Console.WriteLine("Bit array ba2: 13");

         for (int i = 0; i < ba2.Count; i++) {
            Console.Write("{0, -6} ", ba2[i]);
         }

         Console.WriteLine();
         BitArray ba3 = new BitArray(8);
         ba3 = ba1.And(ba2);

         //content of ba3
         Console.WriteLine("Bit array ba3 after AND operation: 12");

         for (int i = 0; i < ba3.Count; i++) {
            Console.Write("{0, -6} ", ba3[i]);
         }

         Console.WriteLine();
         ba3 = ba1.Or(ba2);

         //content of ba3
         Console.WriteLine("Bit array ba3 after OR operation: 61");

         for (int i = 0; i < ba3.Count; i++) {
            Console.Write("{0, -6} ", ba3[i]);
         }

         Console.WriteLine();
   
         Console.ReadKey();
      }
   }
}

Output

Bit array ba1: 60
False False True True True True False False
Bit array ba2: 13
True False True True False False False False
Bit array ba3 after AND operation: 12
False False True True False False False False
Bit array ba3 after OR operation: 61
True False True True False False False False

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