protected void repeaterCourses_ItemCommand(object sender, RepeaterCommandEventArgs e) { var coursesID = Convert.ToInt32(e.CommandArgument); if (e.CommandName == "edit") { Response.Redirect("AddCourses.aspx?id=" + coursesID); } if (e.CommandName == "delete") { CoursesService coursesService = new CoursesService(); coursesService.DeleteCourses(Convert.ToInt32(coursesID)); Response.Redirect("ListCourses.aspx"); } if (e.CommandName == "details") { Response.Redirect("DetailsCourses.aspx?id=" + coursesID); } }