how can i set atributes to @Html.DropDownList
table sample
{
id,
studentid,
courseid,
grade,
studentTeacher
}

ViewBag.Student= new SelectList(db.Course.Where(c => c.StudentId== id), "StudentId","FullName");
ViewBag.CourseId = new SelectList(db.Course, "CourseId ", "Name");
ViewBag.StudentId = new SelectList(db.Student, "StudentId","FullName");

@Html.DropDownList("Student")
 @Html.DropDownList("CourseId ")
 @Html.DropDownList("StudentId ", string.Empty)

@Html.DropDownList("Student", ViewBag.Student)
// etc.