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C# | Number of elements contained in the BitArray

Last Updated : 11 Jul, 2025

The

class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is

i.e,

and false indicates the bit is

i.e,

. This class is contained in

namespace.

property is used to

contained in the BitArray.

• The BitArray class is a collection class in which the capacity is always the same as the count.
• Elements are added to a BitArray by increasing the Length property.
• Elements are deleted by decreasing the Length property.
• Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.

public int Count { get; }

Below programs illustrate the use of

:

// C# code to get the number of 
// elements contained in the BitArray
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr = new BitArray(new byte[] { 0, 1, 0, 1 });

        // To get the number of elements
        // contained in the BitArray
        Console.WriteLine(myBitArr.Count);
    }
}

// C# code to get the number of
// elements contained in the BitArray
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr = new BitArray(new byte[] { 0 });

        // To get the number of elements
        // contained in the BitArray
        Console.WriteLine(myBitArr.Count);
    }
}

• Length and Count return the same value. Length can be set to a specific value, but Count is read-only.
• Retrieving the value of this property is an O(1) operation.

• https://learn.microsoft.com/en-us/dotnet/api/system.collections.bitarray.count?view=netframework-4.7.2

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