public void GetAllGradeForDrp()
{
List <GradeEntities> gradeList = new List <GradeEntities>();
SectionBL sectionBl = new SectionBL();
gradeList = sectionBl.GetAllGradeForDrp();
ViewBag.getAllGradeForDrp = gradeList.Select(x =>
new SelectListItem
{
Text = x.Grade,
Value = x.ID.ToString()
}
);
}