Display data from two tables into one gridview through datasource

i have a problem in joining two tables the reason is my first table persdata is having common field as pno (a single row in a particular person) and the second tables is also having pno(having muti entry for a person as this table is of qualification and a person may have more than 3 qualifications and their grading) sample persdata(table) pno name coy appt  sample qual(table) pno qual grading recommendation i tried my best to do it and not able to proceed i want the output in a single row as in persdata to a gridview with all the qual combined in one coloumn and all the recommendations combined in one coloumn for a person. i am requesting for you help on this