private string StringToHex(string Hexstring)
        {
            /*StringBuilder SB = new StringBuilder();
            for (int i = 0; i < Hexstring.Length; i++)
                SB.Append(Convert.ToInt32(Hexstring[i]).ToString("x") + " ");
            return SB.ToString();*/

             StringBuilder sb = new StringBuilder();
             foreach (char c in Hexstring)
             {
                 sb.Append(Convert.ToString(c, 16));
                 sb.Append("%");
             }
             return sb.ToString().Replace("%d%a", "\r\n");
        }