Adding an element into the Hashtable in C#

CsharpServer Side ProgrammingProgramming

To add an element into the Hashtable, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(){
      Hashtable hash = new Hashtable(10);
      hash.Add("1", "A");
      hash.Add("2", "B");
      hash.Add("3", "C");
      hash.Add("4", "D");
      hash.Add("5","E");
      hash.Add("6", "F");
      hash.Add("7", "G");
      hash.Add("8","H");
      hash.Add("9", "I");
      hash.Add("10", "J");
      Console.WriteLine("Hashtable Key and Value pairs...");
      foreach(DictionaryEntry entry in hash){
         Console.WriteLine("{0} and {1} ", entry.Key, entry.Value);
      }
      Console.WriteLine("Count of entries in Hashtable = "+ hash.Count);
      hash.Add("11", "K");
      Console.WriteLine("Hashtable Key and Value pairs...UPDATED");
      foreach(DictionaryEntry entry in hash){
         Console.WriteLine("{0} and {1} ", entry.Key, entry.Value);
      }
      Console.WriteLine("Count of entries in Hashtable (updated) = "+hash.Count);
   }
}

Output

This will produce the following output −

Hashtable Key and Value pairs...
10 and J
1 and A
2 and B
3 and C
4 and D
5 and E
6 and F
7 and G
8 and H
9 and I
Count of entries in Hashtable = 10 Hashtable Key and Value pairs...UPDATED 10 and J
1 and A
2 and B
3 and C
4 and D
5 and E
6 and F
7 and G
8 and H
9 and I
11 and K
Count of entries in Hashtable (updated) = 11

Example

Let us now see another example −

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(){
      Hashtable hash = new Hashtable(10);
      hash.Add("1", "SUV");
      hash.Add("2", "Electric Cars");
      hash.Add("3", "AUV");
      hash.Add("4", "Utility Vehicle");
      hash.Add("5","Compact Car");
      hash.Add("6", "Sedan");
      hash.Add("7","Crossover");
      Console.WriteLine("Enumerator to iterate through the Hashtable...");
      IDictionaryEnumerator demoEnum = hash.GetEnumerator();
      while (demoEnum.MoveNext())
         Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
   }
}

Output

This will produce the following output −

Enumerator to iterate through the Hashtable...
Key = 1, Value = SUV
Key = 2, Value = Electric Cars
Key = 3, Value = AUV
Key = 4, Value = Utility Vehicle
Key = 5, Value = Compact Car
Key = 6, Value = Sedan
Key = 7, Value = Crossover
raja
Published on 10-Dec-2019 14:21:20
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