Remove all elements from the Collection in C#

To remove all elements from the Collection, the code is as follows −

Example

 Live Demo

using System;
using System.Collections.ObjectModel;
public class Demo {
   public static void Main() {
      Collection<int> col = new Collection<int>();
      col.Add(10);
      col.Add(20);
      col.Add(30);
      col.Add(40);
      col.Add(50);
      col.Add(60);
      col.Add(70);
      col.Add(80);
      Console.WriteLine("Elements in the Collection...");
      foreach(int val in col) {
         Console.WriteLine(val);
      }
      Console.WriteLine("Does the collection has the element 70? = "+col.Contains(70));
      Console.WriteLine("Count of elements = " + col.Count);
      col.Clear();
      Console.WriteLine("Count of elements (updated) = " + col.Count);
   }
}

Output

This will produce the following output −

Elements in the Collection...
10
20
30
40
50
60
70
80
Does the collection has the element 70? = True
Count of elements = 8
Count of elements (updated) = 0

Example

Let us see another example −

 Live Demo

using System;
using System.Collections.ObjectModel;
public class Demo {
   public static void Main() {
      Collection<String> col = new Collection<String>();
      col.Add("A");
      col.Add("B");
      col.Add("C");
      col.Add("D");
      col.Add("E");
      Console.WriteLine("Elements in the Collection...");
      foreach(String val in col) {
         Console.WriteLine(val);
      }
      Console.WriteLine("Does the collection has the element D? = "+(col.Contains("D")));
      Console.WriteLine("Count of elements = " + col.Count);
      col.Clear();
      Console.WriteLine("Count of elements (updated) = " + col.Count);
   }
}

Output

This will produce the following output −

Elements in the Collection...
A
B
C
D
E
Does the collection has the element D? = True
Count of elements = 5
Count of elements (updated) = 0