//function to convert string to byte array 
public static byte[] ConvertStringToByteArray(string stringToConvert) 
{
         return (new UnicodeEncoding()).GetBytes(stringToConvert);
} 

//function to convert byte array to string 
public static string ConvertByteArrayToString(byte[] byteArray)
{
          return (new UnicodeEncoding()).GetString(byteArray);
}