How to use dataset in crystal report from code behind

i made a dataset , and then made a datatable1 that get all record from student , degree,and deparetment table.

it have to mthod GetDetail,GetDetailData();

i also make it crystal report ,and drage column which i need in report. 

but i dont know how i will call it from code behind of .asp page.

i have not tomuch knowledge about dataset and its detial. 

 ReportDocument reportdocument = new ReportDocument();
           reportdocument.Load(Server.MapPath("~/reportTest/studentWthDepartmntAndDegree.rpt"));
            rptStudents.ReportSource = reportdocument;
            rptStudents.RefreshReport();

this code is working for report of oledb . but now for dataset.