See below for a code sample of how to perform byte and string conversions:

using System.Runtime.Remoting.Metadata.W3cXsd2001;public static byte[] GetStringToBytes(string stringValue){    SoapHexBinary result = SoapHexBinary.Parse(stringValue);    return result.Value;}public static string GetBytesToString(byte[] byteArray){    SoapHexBinary result = new SoapHexBinary(byteArray);    return result.ToString();}