Skip to main content

collection in asp.net c#

Collection represents a set of classes or objects that you can access to different type for different purpose. 

The name space of collection classes are

1. System. Collections
2. System.Collections.Generic

http://code-sample.net/images/collectionclasses%20.png

The System.Collection class contain the many classes for different purpose which explains in below.

  1. ArrayList
  2. Dictionary 
  3. HashTable 
  4. Stack
  5. Queue
ArrayList

Array List is collection with different data type using the System.Collection namespace. It is dynamic array and provides the feature for dynamic access.

http://code-sample.net/images/MethodsCollection.png

Example for Add() method

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void ArrayListColl()
                               {
                                              ArrayList objArrayList = new ArrayList();
                                              objArrayList.Add("India");
                                              objArrayList.Add("Uttar Pradesh");
                                              objArrayList.Add("Kushinagar");

                                              foreach (string element in objArrayList)
                                              {
                                                             Console.WriteLine(element);
                                                             Console.ReadLine();
                                              }
                               }
                               static void Main(string[] args)
                               {
                                              ArrayListColl();
                               }
               }
}

Output

http://code-sample.net/images/ArrListAddOutput.png
Again another example for RemoveAt() method

Remove the records with help of specific index.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void ArrayListColl()
                               {
                                              ArrayList objArrayList = new ArrayList();
                                              objArrayList.Add("India");
                                              objArrayList.Add("Uttar Pradesh");
                                              objArrayList.Add("Kushinagar");
                                              objArrayList.RemoveAt(1);
                                              foreach (string element in objArrayList)
                                              {
                                                             Console.WriteLine(element);
                                                             Console.ReadLine();
                                              }
                               }
                              
                               static void Main(string[] args)
                               {
                                              ArrayListColl();
                               }
               }
}
Output
In the above example, remove the string from the Array List at index 1. So output is below.
http://code-sample.net/images/ArrListRemoveAtOutput.png
Again another example for Remove () method
Remove the records with help of specific object.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void ArrayListColl()
                               {
                                              ArrayList objArrayList = new ArrayList();
                                              objArrayList.Add("India");
                                              objArrayList.Add("Uttar Pradesh");
                                              objArrayList.Add("Kushinagar");
                                              objArrayList.Remove("Kushinagar");
                                              foreach (string element in objArrayList)
                                              {
                                                             Console.WriteLine(element);
                                                             Console.ReadLine();
                                              }
                               }
                              
                              static void Main(string[] args)
                               {
                                              ArrayListColl();
                               }
               }
}
OutPut :

http://code-sample.net/images/ArrListRemoveOutput.png
Again another example for Insert () method

Insert the records with help of specific index.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void ArrayListColl()
                               {
                                              ArrayList objArrayList = new ArrayList();
                                              objArrayList.Insert(0,"India");
                                              objArrayList.Insert(1,"Uttar Pradesh");
                                              objArrayList.Insert(2,"Kushinagar");
                                             
                                              foreach (string element in objArrayList)
                                              {
                                                             Console.WriteLine(element);
                                                             Console.ReadLine();
                                              }
                               }
                              
                               static void Main(string[] args)
                               {
                                              ArrayListColl();
                               }
               }
}
                                             
OupPut

http://code-sample.net/images/ArrListInsertOutput.png
Dictionary
The Dictionary collection class is a generic class that contain the any data type. The Dictionary class contain two parameters (generic type) one is key and other is value. Before implementation, we must import the System.Collections.Generic namespace. The dictionary type provides fast searching with key to get its values. Dictionary is used when we have different elements. The Dictionary contains the some different feature.
http://code-sample.net/images/dictionaryColliection.png
Syntax :
Dictionary objDict=new Dictionary();
Example for Add, ContainsKey and ContainsValue
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void DictionaryMethod()
                               {
                                              Dictionary objDict=new Dictionary();
                                              objDict.Add("India",1);
                                              objDict.Add("UP",2);
                                              objDict.Add("Kushinagar",3);
                                                            
                                              if (objDict.ContainsKey("India"))
                                              {
                                                             dynamic text = objDict["India"];
                                                             Console.WriteLine(text);
                                                             Console.ReadLine();
                                              }

                                              if (objDict.ContainsValue(1))
                                              {
                                                             Console.WriteLine("India");
                                                             Console.ReadLine();
                                              }

                               }
                               static void Main(string[] args)
                               {
                                              DictionaryMethod();
                               }
               }
}

OutPut :

http://code-sample.net/images/dictionaryAdd.png
Another example for dictionary KeyValuePair objects
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void KeyValuePair()
                               {
                                              dynamic keyValList = new List>();
                                              keyValList.Add(new KeyValuePair("India", 1));
                                              keyValList.Add(new KeyValuePair("UP", 2));
                                              keyValList.Add(new KeyValuePair("Kushinagar", 4));

                                              foreach (var element in keyValList)
                                              {
                                                             Console.WriteLine(element);
                                                             Console.ReadLine();
                                              }
                               }
                               static void Main(string[] args)
                               {
                                              KeyValuePair();
                               }
               }
}

OutPut :

http://code-sample.net/images/KeyValuePair.png
Another example for KeyValuePair

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
               public class Program
               {
                               public static void KeyValuePair()
                               {
                                              Dictionary keyValList = new Dictionary();

                                              keyValList.Add("India", 1);
                                              keyValList.Add("UP", 2);
                                              keyValList.Add("Kushinagar", 4);

                                              foreach (KeyValuePair element in keyValList)
                                              {
                                                             Console.WriteLine("key = {0}, value = {1}", element.Key,element.Value);
                                                            
                                              }
                                              Console.ReadKey();
                               }
                               static void Main(string[] args)
                               {
                                              KeyValuePair();
                               }
               }
}


OutPut :

http://code-sample.net/images/KeyValuePairSecond.png

HashTable
HashTable is a collection classes which provide the support to key base searching and stored the key value pair type collection data. HashTable searching the element is very fast but slower then generic Dictionary type. In HashTable we can maintain the data uniqueness that means without having null values and duplicate value. In HashTable, both key and value is object and we can retrieve the items from the HashTable by providing the key.
Syntax :
Hashtable objHash=new Hashtable();
HashTable contain the methods which are give below in
http://code-sample.net/images/HashTable.png
Simple example of HashTable

Simple example of HashTable

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void HashTableMethod()
                               {
                                  Hashtable objHash=new Hashtable();
                                  objHash.Add("India", 1);
                                  objHash.Add("UP", 2);
                                  objHash.Add("Kushinagar", 4);

                                  foreach (DictionaryEntry element in objHash)
                                              {
                                                             Console.WriteLine("key = {0}, value = {1}", element.Key,element.Value);
                                                            
                                              }
                                              Console.ReadKey();
                               }
                               static void Main(string[] args)
                               {
                                              HashTableMethod();
                               }
               }
}

OutPut :

http://code-sample.net/images/HashTableOutput.png
AAnother example to get the keys using HashTable

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static void HashTableMethod()
                               {
                                  Hashtable objHash=new Hashtable();
                                  objHash.Add("India", 1);
                                  objHash.Add("UP", 2);
                                  objHash.Add("Kushinagar", 4);

                                              IDictionaryEnumerator objDe = objHash.GetEnumerator();
                                              while (objDe.MoveNext())
                                              {
                                                             string result = objDe.Key.ToString();
                                                             Console.WriteLine(result);
                                              }
                                              Console.ReadKey();
                               }
                               static void Main(string[] args)
                               {
                                              HashTableMethod();
                               }
               }
}

OutPut :

http://code-sample.net/images/HashTableOutput1.png
Another example to get the values using HashTable

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace CollectionClasses
{  
               public class Program
               {
                               public static void HashTableMethod()
                               {
                                  Hashtable objHash=new Hashtable();
                                  objHash.Add("India", 1);
                                  objHash.Add("UP", 2);
                                  objHash.Add("Kushinagar", 4);

                                              IDictionaryEnumerator objDe = objHash.GetEnumerator();
                                              while (objDe.MoveNext())
                                              {
                                                             string result = objDe.Value.ToString();
                                                             Console.WriteLine(result);
                                              }
                                              Console.ReadKey();
                               }
                               static void Main(string[] args)
                               {
                                              HashTableMethod();
                               }
               }
}

OutPut :

http://code-sample.net/images/HashTableOutput2.png
Stack
Stack is a Last-In-First-Out collection that is called LIFO. Stack is a generic type collection. Stack worked on two basic components which are 1. Push 2. Pop Push is formally worked for insert an item on the top in stack. Pop is formally worked on the remove the last inserted record from the stack.

Example for Push
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
  
               public class Program
               {
                               public static Stack StackMethod()
                               {
                                              Stack objStack = new Stack();
                                              objStack.Push(1);
                                              objStack.Push(10);
                                              objStack.Push(100);
                                              objStack.Push(1000);
                                              objStack.Push(10000);
                                              return objStack;
                               }
                               static void Main(string[] args)
                               {
                                              dynamic stack= StackMethod();
                                              foreach (int item in stack)
                                              {
                                                             Console.WriteLine(item);
                                              }
                                              Console.ReadLine();
                               }
               }
}

OutPut :

http://code-sample.net/images/Stack1.png
Another example for Pop
namespace CollectionClasses
{
               public class Program
               {
                               public static Stack StackMethod()
                               {
                                              Stack objStack = new Stack();
                                              objStack.Push(1);
                                              objStack.Push(10);
                                              objStack.Push(100);
                                              objStack.Push(1000);
                                              objStack.Push(10000);
                                              return objStack;
                               }
                               static void Main(string[] args)
                               {
                                              Stack stack= StackMethod();
                                              int pop= stack.Pop();
                                              Console.WriteLine(pop);
                                              Console.ReadLine();
                               }
               }
}

OutPut :

http://code-sample.net/images/Stack2.png
Example using Push, Pop and Peek
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
               public class Program
               {
                               public static Stack StackMethod()
                               {
                                              Stack objStack = new Stack();
                                              objStack.Push(1);
                                              objStack.Push(10);
                                              objStack.Push(100);
                                              objStack.Push(1000);
                                              objStack.Push(10000);
                                              return objStack;
                               }
                               static void Main(string[] args)
                               {
                                              Stack stack= StackMethod();

                                              Console.WriteLine("Display the Stack");
                                              foreach (int i in stack)
                                              {
                                                             Console.WriteLine(i);
                                              }

                                              int pop = stack.Pop();
                                              Console.WriteLine("pop the element from the stack!");
                                              Console.WriteLine(pop);

                                              int peek= stack.Peek();
                                              Console.WriteLine("peek the element from the stack!");
                                              Console.WriteLine(peek);
                                              Console.ReadLine();
                               }
               }
}
The Output as given below
http://code-sample.net/images/Stack3.png
Queue
Queue is First-In-First-Out collection that is classed FIFO. Queue is a generic collection. Queue provides the First - come first- service.
Example
 using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CollectionClasses
{
               public class Program
               {
                               public static Queue QueueMethod()
                               {
                                              // Add integers to queue.
                                              Queue objQueue = new Queue();
                                              objQueue.Enqueue(1);
                                              objQueue.Enqueue(10);
                                              objQueue.Enqueue(100);
                                              objQueue.Enqueue(1000);

                                              // Loop through queue.
                                              foreach (int i in objQueue)
                                              {
                                                             Console.WriteLine(i);
                                              }
                                              return objQueue;
                               }
                               static void Main(string[] args)
                               {
                                              Queue queu = QueueMethod();
                                              Console.WriteLine(queu);
                                              Console.ReadLine();
                               }
               }
}


The Output as given below
http://code-sample.net/images/Queu.png
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVADOR

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin

React | Encryption and Decryption Data/Text using CryptoJs

To encrypt and decrypt data, simply use encrypt () and decrypt () function from an instance of crypto-js. Node.js (Install) Requirements: 1.       Node.js 2.       npm (Node.js package manager) 3.       npm install crypto-js npm   install   crypto - js Usage - Step 1 - Import var   CryptoJS  =  require ( "crypto-js" ); Step 2 - Encrypt    // Encrypt    var   ciphertext  =  CryptoJS . AES . encrypt ( JSON . stringify ( data ),  'my-secret-key@123' ). toString (); Step 3 -Decrypt    // Decrypt    var   bytes  =  CryptoJS . AES . decrypt ( ciphertext ,  'my-secret-key@123' );    var   decryptedData  =  JSON . parse ( bytes . toString ( CryptoJS . enc . Utf8 )); As an Example,   import   React   from   'react' ; import   './App.css' ; //Including all libraries, for access to extra methods. var   CryptoJS  =  require ( "crypto-js" ); function   App () {    var   data

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

Encryption and Decryption Data/Password in Angular

You can use crypto.js to encrypt data. We have used 'crypto-js'.   Follow the below steps, Steps 1 –  Install CryptoJS using below NPM commands in your project directory npm install crypto-js --save npm install @types/crypto-js –save After installing both above commands it looks like  – NPM Command  1 ->   npm install crypto-js --save NPM Command  2 ->   npm install @types/crypto-js --save Steps 2  - Add the script path in “ angular.json ” file. "scripts" : [                "../node_modules/crypto-js/crypto-js.js"               ] Steps 3 –  Create a service class “ EncrDecrService ” for  encrypts and decrypts get/set methods . Import “ CryptoJS ” in the service for using  encrypt and decrypt get/set methods . import  {  Injectable  }  from   '@angular/core' ; import   *   as   CryptoJS   from   'crypto-js' ; @ Injectable ({    providedIn:   'root' }) export   class   EncrDecrS