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C# | Bitwise AND between the elements of 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.

method is used to perform the bitwise AND operation between the elements of the current BitArray object and the corresponding elements in the specified array. The current BitArray object will be modified to store the result of the bitwise AND operation.

• 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.
• The BitArray class provides methods like And, Or, Xor, Not, and SetAll.
• Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.

public System.Collections.BitArray And (System.Collections.BitArray value);

Here,

is the array with which to perform the bitwise AND operation.

It returns an array containing the result of the bitwise AND operation, which is a reference to the current BitArray object.

• ArgumentNullException : If the value is null.
• ArgumentException : If the value and the current BitArray do not have the same number of elements.

Below given are some examples to understand the implementation in a better way:

// C# code to do bitwise
// AND between BitArray
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr1 = new BitArray(4);

        // Creating a BitArray
        BitArray myBitArr2 = new BitArray(4);

        // Initializing values in myBitArr1
        myBitArr1[0] = false;
        myBitArr1[1] = false;
        myBitArr1[2] = true;
        myBitArr1[3] = true;

        // Initializing values in myBitArr2
        myBitArr2[0] = false;
        myBitArr2[2] = false;
        myBitArr2[1] = true;
        myBitArr2[3] = true;

        // function calling
        PrintValues(myBitArr1.And(myBitArr2));
    }

    // Displaying the result
    public static void PrintValues(IEnumerable myList)
    {
        foreach(Object obj in myList)
        {
            Console.WriteLine(obj);
        }
    }
}

False
False
False
True

// C# code to do bitwise
// AND between BitArray
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating a BitArray
        BitArray myBitArr1 = new BitArray(4);

        // Creating a BitArray
        BitArray myBitArr2 = new BitArray(6);

        // Initializing values in myBitArr1
        myBitArr1[0] = false;
        myBitArr1[1] = false;
        myBitArr1[2] = true;
        myBitArr1[3] = true;

        // Initializing values in myBitArr2
        myBitArr2[0] = false;
        myBitArr2[2] = false;
        myBitArr2[1] = true;
        myBitArr2[3] = true;
        myBitArr2[4] = true;
        myBitArr2[5] = true;

        // function calling
        // This should raise "ArgumentException"
        // as array lengths are not same
        PrintValues(myBitArr1.And(myBitArr2));
    }

    // Displaying the result
    public static void PrintValues(IEnumerable myList)
    {
        foreach(Object obj in myList)
        {
            Console.WriteLine(obj);
        }
    }
}

Unhandled Exception: System.ArgumentException: Array lengths must be the same.

• The bitwise AND operation returns true if both operands are true, and returns false if one or both operands are false.
• This method is an O(n) operation, where n is Count.

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

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