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C# List<T>.Clear() Method with Example

C# List<T>.Clear() Method: In this tutorial, we will learn about the Clear() method of List collection with its usage, syntax, and an example using C# program. By IncludeHelp Last updated : April 15, 2023

C# List<T>.Clear() Method

List<T>.Clear() method is used to clear the list, it remove all elements from the list.

Syntax

void List<T>.Clear();

Parameter(s)

It accepts nothing.

Return Value

It returns nothing – it's returns type is void

Example

int list declaration:
List<int> a = new List<int>();

Adding elements:
a.Add(10);
a.Add(20);
a.Add(30);
a.Add(40);
a.Add(50);
    
Removing elements:
a.Clear();
    
Output:
None

C# program to remove all items from the list using List<T>.Clear() method

using System;
using System.Text;
using System.Collections.Generic;

namespace Test {
  class Program {
    static void printList(List <int> lst) {
      //printing elements
      foreach(int item in lst) {
        Console.Write(item + " ");
      }
      Console.WriteLine();
    }

    static void Main(string[] args) {
      //integer list
      List <int> a = new List <int> ();

      //adding elements
      a.Add(10);
      a.Add(20);
      a.Add(30);
      a.Add(40);
      a.Add(50);

      if (a.Count > 0) {
        //print the list
        Console.WriteLine("list elements...");
        printList(a);
      } else {
        Console.WriteLine("list is empty");
      }

      //clear all elements
      a.Clear();

      //list after removing the elements
      if (a.Count > 0) {
        Console.WriteLine("list elements after removing elements...");
        printList(a);
      } else {
        Console.WriteLine("list is empty");
      }

      //hit ENTER to exit
      Console.ReadLine();
    }
  }
}

Output

list elements...
10 20 30 40 50
list is empty

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