// this method should be called for numbers greater than 0. // When calling this function, only the first parameter should be given public string ConvertToBinaryNumber(int DecimalNumber, StringBuilder BinaryNumber = null) { if (BinaryNumber == null) { BinaryNumber = new StringBuilder(); } if (DecimalNumber > 0) { BinaryNumber.Insert(0, DecimalNumber % 2); return(ConvertToBinaryNumber(DecimalNumber / 2, BinaryNumber)); } return(BinaryNumber.ToString() != "" ? BinaryNumber.ToString() : "0"); }