Remove all elements from the Hashtable in C#

To remove all elements from 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("Is the Hashtable having fixed size? = "+hash.IsFixedSize);       Console.WriteLine("Count of entries in Hashtable = "+ hash.Count);       hash.Clear();       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 Is the Hashtable having fixed size? = False Count of entries in Hashtable = 10 Count of entries in Hashtable (updated) = 0

Example

Let us see another example −

 Live Demo

using System; using System.Collections; public class Demo {    public static void Main() {       Hashtable hash = new Hashtable(10);       hash.Add("One", "100");       hash.Add("Two", "200");       hash.Add("Three", "300");       hash.Add("Four", "400");       hash.Add("Five","500");       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.Clear();       Console.WriteLine("Count of entries in Hashtable (updated) = "+hash.Count);    } }

Output

This will produce the following output −

Hashtable Key and Value pairs... One and 100 Five and 500 Three and 300 Two and 200 Four and 400 Count of entries in Hashtable = 5 Count of entries in Hashtable (updated) = 0