How to convert a string into an array of bit ?

i don't need bytes but bits (01001 etc....)

Use System.Text.Encoding.GetBytes(string); this function returns Byte array. Refer http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemtextencoderclasstopic.asp Thanks, Jagan Mohan