c# hex to dec, dec to hex

//-----------------------------------------------------------
        // Dec String -> Hex String
        //-----------------------------------------------------------
        private string DecToHex(string s)
        {
            string DecToHex = "";
            try
            {
                //decimal decs = Decimal.Parse(s);
                long decs = Int64.Parse(s);
                DecToHex = Convert.ToString(decs, 16).PadLeft(2,'0');
                DecToHex = DecToHex.ToUpper();
            }
            catch (Exception ex)
            {
                DecToHex = ex.Message.ToString();
            }
            return DecToHex;
        }

        //-----------------------------------------------------------
        // Hex String -> Dec String
        //-----------------------------------------------------------
        private string HexToDec(string s)
        {
            string HexToDec = "";
            try
            {
                HexToDec = Convert.ToInt64(s, 16).ToString();
            }
            catch (Exception ex)
            {
                HexToDec = ex.Message.ToString();
            }
            return HexToDec;
        }


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