>>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 :-(