In a database i have 3 tables course(course_n ame,course_cd,d epartment_cd),d epartment(depar tment_cd,depart ment_name),batc h(batch_id,year _of_batch) i want to select course_name from course table in combox1 then all department_name of that course_name in combobox2 from department table how to do it in vb.net.then year_of_batch from batch table of that department_name in combobox3 .please reply....