To Converts all letters in a text string to lowercase in axapta x++ language You can try following code in job. I hope this can be helpful for you for string manipulation programs.
strLwr (String Lower)
info("str strLwr(str _text)");
info("Converts all letters in a text string to lower case.");
info("strLwr(\"ABcd123xYZ\") " + strLwr("ABcd123xYZ"));