You need a space before and after + path + in your string concatenation e.g.
cmd.CommandText = "LOAD DATA INFILE " + path + " INTO TABLE table1 FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' IGNORE 1 LINES(dat1,dat2,dat3,@ts) SET timedtamp = DATE_FORMAT(STR_TO_DATE(@ts,'%d/%m/%Y %H:%i:%s'),'%Y-%m-%d %H:%i:%s')"