Adding an element into the Hashtable in C#

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