Encodes a string into a base16/hexadecimal string format. Useful for maintaining case sensitivity where case sensitivity cannot be maintained, like a filename or URL.

ToHexBytes.cs

using System.Text;
using System.Runtime.Remoting.Metadata.W3cXsd2001;

public static string ToHexBytes(this string plainText, Encoding encoding = null)
{
  encoding = encoding ?? Encoding.UTF8;
  var bytes = encoding.GetBytes(plainText);
  return new SoapHexBinary(bytes).ToString();
}
public static string FromHexBytes(this string hexText, Encoding encoding = null)
{
  encoding = encoding ?? Encoding.UTF8;
  var bytes = SoapHexBinary.Parse(hexText).Value;
  return encoding.GetString(bytes);
}