1) Enclose the path in your query with single quotes.
string uploadQry = "LOAD DATA INFILE '" + path + "' INSERT INTO TABLE sla1 FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' IGNORE 1 LINES";
2) Remove INSERT command from your Query.
string uploadQry = "LOAD DATA INFILE '" + path + "' INTO TABLE sla1 FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' IGNORE 1 LINES";