dataset showing System.Byte[]

Question

dataset showing System.Byte[]

 

 

this is my code

 

SELECT GROUP_CONCAT(s.Skill,'(',es.Experience,' Months',')' SEPARATOR '; ') AS testSkill
FROM employeeskills es, skilllookup s
WHERE es.Skill = s.SkillId AND R.EmployeeCode = es.EmployeeId

ORDER BY es.Experience