How to read and write bits in C#

If performance is not a major consideration (as I'm using string conversions), then here are some easy to use bit functions written in C# :

using System;

class Bits
{
     static void Main()
     {
         int i = 255; // or whatever
         string bits = ConvertToBits(i);
         Console.WriteLine("Bit representation of {0} is {1}", i, bits);
         int j  = GetBit(i, 1);
         Console.WriteLine("Bit 1 is {0}", j);
         Console.WriteLine("Setting bit 1 to 0");
         SetBit(ref i, 1, 0);
         Console.WriteLine("i is now {0}", i);
         bits = ConvertToBits(i);                 
         Console.WriteLine("Bit representation of {0} is {1}", i, bits);
         j  = GetBit(i, 2);
         Console.WriteLine("Bit 2 is {0}", j);
         Console.WriteLine("Flipping bit 2");
         FlipBit(ref i, 2);
         Console.WriteLine("i is now {0}", i);
         bits = ConvertToBits(i);                 
         Console.WriteLine("Bit representation of {0} is {1}", i, bits);
         Console.ReadLine();   
     }

     public static string ConvertToBits(int i)
     {
         string bits = Convert.ToString(i, 2);
         int len = bits.Length;
         if (len == 32)
         {
            return bits;
         }
         return new string('0', 32 - len) + bits;
     }

    public static int ConvertFromBits(string bits)
    {
        return Convert.ToInt32(bits, 2);
    }

    public static int GetBit(int i, int bitNum)
    {
        if (bitNum < 0 || bitNum > 31) return -1; // error value      
        return ConvertToBits(i)[31 - bitNum] - 48;
    }

    public static void SetBit(ref int i, int bitNum, int value)
    {
        if (bitNum < 0 || bitNum > 31 || value < 0 || value > 1) return; // i unchanged       
        char[] bitArray = ConvertToBits(i).ToCharArray();
        bitArray[31 - bitNum] = (char)(value + 48);
        i = Convert.ToInt32(new string(bitArray), 2);
    }  

    public static void FlipBit(ref int i, int bitNum)
    {
        if (bitNum < 0 || bitNum > 31) return; // i unchanged       
        char[] bitArray = ConvertToBits(i).ToCharArray();
        bitArray[31 - bitNum] = (bitArray[31 - bitNum] == '1') ? '0' : '1';
        i = Convert.ToInt32(new string(bitArray), 2);
    }          
        
}

Hope this will help.

http://local.wasp.uwa.edu.au/~pbourke/dataformats/bmp/BITMAP.C