C# | Set the bit at a specific position in the BitArray to the specified value Last Updated : 11 Jul, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.Set(Int32, Boolean) method is used to set the bit at a specific position in the BitArray to the specified value. Properties: 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. Syntax: public void Set (int index, bool value); Parameters: index : The zero-based index of the bit to set. value : The Boolean value to assign to the bit. Exception: This method will give ArgumentOutOfRangeException if the index is less than zero or the index is greater than or equal to the number of elements in the BitArray. Note: This method is an O(1) operation. Below programs illustrate the use of BitArray.Set(Int32, Boolean) Method: Example 1: CSHARP // C# code to set the bit at // a specific position in the // BitArray to the specified value using System; using System.Collections; class GFG { // Driver code public static void Main() { // Creating a BitArray myBitArr // Initializing all the values to false BitArray myBitArr = new BitArray(5, false); // Printing the values in myBitArr // It should display all the bits as false Console.WriteLine("Initially the bits are as : "); PrintIndexAndValues(myBitArr); // Setting bit at index 3 to true myBitArr.Set(3, true); // Printing the values in myBitArr Console.WriteLine("Finally the bits are as : "); PrintIndexAndValues(myBitArr); } // Function to display bits public static void PrintIndexAndValues(IEnumerable myArr) { foreach(Object obj in myArr) { Console.WriteLine(obj); } } } Output: Initially the bits are as : False False False False False Finally the bits are as : False False False True False Example 2: CSHARP // C# code to set the bit at // a specific position in the // BitArray to the specified value using System; using System.Collections; class GFG { // Driver code public static void Main() { // Creating a BitArray myBitArr BitArray myBitArr = new BitArray(5); // Initializing all the bits in myBitArr myBitArr[0] = false; myBitArr[1] = true; myBitArr[2] = true; myBitArr[3] = false; myBitArr[4] = true; // Printing the values in myBitArr Console.WriteLine("Initially the bits are as : "); PrintIndexAndValues(myBitArr); // Setting bit at index 2 to false myBitArr.Set(2, false); // Setting bit at index 3 to true myBitArr.Set(3, true); // Printing the values in myBitArr Console.WriteLine("Finally the bits are as : "); PrintIndexAndValues(myBitArr); } // Function to display bits public static void PrintIndexAndValues(IEnumerable myArr) { foreach(Object obj in myArr) { Console.WriteLine(obj); } } } Output: Initially the bits are as : False True True False True Finally the bits are as : False True False True True Reference: https://learn.microsoft.com/en-us/dotnet/api/system.collections.bitarray.set?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | Set all bits in the BitArray to the specified value S Sahil_Bansall Follow Improve Article Tags : C# CSharp-method CSharp-Collections-Namespace CSharp-Collections-BitArray Similar Reads C# | Gets or sets the value of the bit at a specific position in the BitArray BitArray.Item[Int32] Property is used to get or set the value of the bit at a specific position in the BitArray. Syntax: public bool this[int index] { get; set; } Here, the index is the zero-based Index of the value which is to get or set. Return Value: It returns a boolean value of the bit at posit 2 min read C# | Get value of the bit at a specific position in BitArray The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.Get(Int32) method is used to get the value of the b 3 min read C# | Set all bits in the BitArray to the specified value The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.SetAll(Boolean) method is used to set all bits in t 3 min read C# | Inverting all bit values in BitArray The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.Not method inverts all the bit values in the curren 2 min read C# | Get or set the number of elements in the BitArray The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.Length property is used to get or set the number of 2 min read C# | Enumerator that iterates through the BitArray The BitArray class manages a compact array of bit values, which are represented as Booleans, where true indicates that the bit is on i.e, 1 and false indicates the bit is off i.e, 0. This class is contained in System.Collections namespace. BitArray.GetEnumerator method is used to get an enumerator w 3 min read Like