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

Labels

Labels:
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...
Read more

Why doesn't App Module exist in Angular 17?

Today, I just started exploring Angular version 17 using ng new and found a problem for the newly created project using the command - ng new. The problem is: Path "/src/app/app.module.ts" does not exist while doing ng add in the Angular project. The ‘ng new’ does not generate app.module.ts in the src root folder Angular CLI 17.0.0. From Angular 17 onwards, standalone is now the new default for the CLI . So when we create a new project ‘ app.module.ts ’ file will not create Path " /src/app/app.module.ts ". Run the following command to create the new project including the file ‘app.module.ts’ in your project: ng new AngularMap  --no-standalone Note: Here ‘AngularMap’ is the project name I created. Standalone components are a feature introduced in Angular version 14. Now the changes applied in angular 17 default, the Angular team strongly recommends using them as they are easier to use, and understand.
Read more

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 ...
Read more

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 SALVA...
Read more

SOLID Principle - Dependency Inversion Principle (DIP)

The SOLID Principles are the design principles that enable us to manage several software design problems. These principles provide us with ways to move from tightly coupled code to loosely coupled and encapsulated real business needs properly. Also readable, adaptable, and scalable code. The SOLID Principles  guide developers as they write readable, adaptable, and scalable code or design an application. The SOLID Principles can be applied to any OOP program. The SOLID Principles were developed by computer science instructor and author Robert C. Martin. Now, SOLID principles have also been adopted in both agile development and adaptive software development. The 5 principles of SOLID are: 1.       Single-Responsibility Principle (SRP) 2.       Open-closed principle (OCP) 3.       Liskov Substitution Principle (LSP) 4.       Interface Segregation Principle (ISP) 5.    ...
Read more