>>>Hi All, just messing around - not a work thing - if I have a string of binary digits such as
>>>
>>>

>>>string s = "0101000001000101010101000100010101010010"
>>>

>>>
>>>how do I convert it to text ?, all the Convert.* methods I've looked at require a byte[] array as an arg and I don't know how to create one !
>>
>>Pete,
>>
>>I'm not sure whether it's the best way to go , and I have not tested it either, but
>>
>>(1) initialize a BitArray
>>(2) loop throught the string and assign the elements of the bitArray depending on 0 or 1
>>(3) initialize a Byte array
>>(4) I see that the BitARray has a CopyTo method wich accepts a Byte array
>>http://msdn.microsoft.com/en-us/library/system.collections.bitarray.copyto.aspx
>>
>>
>>Alternatively, you can directly create a byte array and loop through the string
>>
>>

>>if( string[stringindex] == '1' ) {
>>	the byte index = stringIndex / 8
>>	the bit to set =  7 - (stringIndex %8),
>>
>>	// you may have to cast the right hand side to (byte)
>>
>>	byteArray[ stringIndex / 8] |= ( 1 <<  (  7 - (stringIndex %8)))
>>
>>	or maybe due to widening
>>	byteArray[ stringIndex / 8]  = (byte)( byteArray[ stringIndex / 8]  | byteArray[ stringIndex / 8] | ( 1 <<  (  7 - (stringIndex %8))))
>>}
>>

>
>Hi Greg, thanks for your time - if you see my reply to Neil I can create the byte array but the ConvertToBase64String method returns rubbish. I read the M$ article and can't really see the point of BitArrays ? - maybe that's me :-(

Try this:

string result = string.Empty;
            for (int i = 0; i < s1.Length; i += 8)
            {
                 result += Convert.ToChar(Convert.ToInt32(s1.Substring(i, 8), 2));
            }