Queue.Clear Method in C#

Last Updated : 11 Jul, 2025
This method is used to remove the objects from the Queue. This method is an O(n) operation, where n is the total count of elements. And this method comes under System.Collections namespace. Syntax: 
public void Clear ();
Below given are some examples to understand the implementation in a better way: Example 1: csharp 
// C# code to illustrate the
// Queue.Clear Method
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Queue
        Queue q = new Queue();

        // Inserting the elements into the Queue
        q.Enqueue(1);
        q.Enqueue(2);
        q.Enqueue(2);
        q.Enqueue(4);

        // Displaying the count of elements
        // contained in the Queue before
        // removing all the elements
        Console.Write("Total number of elements "+
                           "in the Queue are : ");

        Console.WriteLine(q.Count);

        // Removing all elements from Queue
        q.Clear();

        // Displaying the count of elements
        // contained in the Queue after
        // removing all the elements
        Console.Write("Total number of elements"+
                         " in the Queue are : ");

        Console.WriteLine(q.Count);
    }
}
Output: 
Total number of elements in the Queue are : 4
Total number of elements in the Queue are : 0
Example 2: csharp 
// C# code to illustrate the
// Queue.Clear Method
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a Queue
        Queue q = new Queue();
 
        // Inserting the elements into the Queue
        q.Enqueue("C");
        q.Enqueue("C++");
        q.Enqueue("Java");
        q.Enqueue("PHP");
        q.Enqueue("HTML");
        q.Enqueue("Python");

        // Displaying the count of elements
        // contained in the Queue before
        // removing all the elements
        Console.Write("Total number of elements "+
                           "in the Queue are : ");

        Console.WriteLine(q.Count);

        // Removing all elements from Queue
        q.Clear();

        // Displaying the count of elements
        // contained in the Queue after
        // removing all the elements
        Console.Write("Total number of elements "+
                           "in the Queue are : ");

        Console.WriteLine(q.Count);
    }
}
Output: 
Total number of elements in the Queue are : 6
Total number of elements in the Queue are : 0
Reference:
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