public void getStudentData() { gridViewUniversity.DataSource = lbManageEntity.showPandingStudent(); gridViewUniversity.DataBind(); gridViewLibraray.DataSource = lbManageEntity.showPandingStudentLib(); gridViewLibraray.DataBind(); gridViewUniversity.Visible = true; gridViewLibraray.Visible = true; GridViewTeacher.Visible = false; GridViewTeacherLogin.Visible = false; PanelBook.Visible = false; }