show data in on crystal report from two tables generating roll no slips

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C#

Windows

forms

CrystalReports

hi,

i have problem with crystal reports,
i have tow tables in my dataSet

personal info
   slipId (pk)
   stdRollNo
   stdRegNo
   stdName
   stdFatherName
   stdCenterName

Subjects
  subId (Pk)
  slipId (Fk) foreign key from personal info
  subName
  paperDate
  paperTime

i want to generate rollNo slips through crystal reports
when i get data against particular roll no then it works fine,
when i want to get all slips for all registered students,
then there is problem, all subjects are shown on the report and only 1 personal info on top.,

how to get records one by one, personal info and then related subjects, and so on for all students..