public ActionResult Index(int?size, int?page, string searchString)
{
ViewBag.CurrentFilter = searchString;
var roleStaff = RoleManager.Roles.FirstOrDefault(x => x.Name == "Staff");
var lstUserId = _repoUser.FindAll(x => x.RoleId == roleStaff.Id).Select(x => x.UserId).ToList();
var lstUser = UserManager.Users.Where(x => lstUserId.Any(p => p.Contains(x.Id))).ToList();
var roleStudent = RoleManager.Roles.FirstOrDefault(x => x.Name == "Student");
//total staff
ViewBag.CountStaff = lstUserId.Count();
//total student
ViewBag.CountStudent = _repoUser.FindAll(x => x.RoleId == roleStudent.Id).Count();
//total competition
ViewBag.CountCompetition = _repoCompetition.Count();
//total post
ViewBag.CountPost = _repoPost.Count();
ViewBag.stt = 1;
ViewBag.currentSize = size; // tạo biến kích thước trang hiện tại
ViewBag.total = lstUser.Count;
page = page ?? 1;
int pageSize = (size ?? 8);
int pageNumber = (page ?? 1);
return(View(lstUser.ToPagedList(pageNumber, pageSize)));
}