public void getTeacherData() { GridViewTeacher.DataSource = lbManageEntity.showPandingTeacher(); GridViewTeacher.DataBind(); GridViewTeacherLogin.DataSource = lbManageEntity.showPandingTeacherLib(); GridViewTeacherLogin.DataBind(); gridViewLibraray.Visible = false; gridViewUniversity.Visible = false; GridViewTeacher.Visible = true; GridViewTeacherLogin.Visible = true; PanelBook.Visible = false; }