public class Pager
     
       where T : new()    {        private IEnumerable
      
        _all;        private IEnumerable
       
         _current;        public Pager()            : this(0, 1000)        {        }        public Pager(int pageIndex, int pageSize)            : this(null, pageIndex, pageSize)        {        }        public Pager(IEnumerable
        
          items, int pageIndex = 0, int pageSize = 10)        {            PageIndex = pageIndex;            PageSize = pageSize;            if (items != null)            {                _all = items;                var count = _all.Count();                PageCount = count % pageSize > 0 ? (count / pageSize + 1) : count / pageSize;            }        }        public int PageIndex { get; set; }        public int PageSize { get; private set; }        public int PageCount        {            get;            set;        }        public IEnumerable
         
           Current        {            get            {                if (_all != null) _current = _all.Skip(PageIndex * PageSize).Take(PageSize);                return _current;            }            set { _current = value; }        }    }
         
        
       
      
     

this pager supports dual methods, memory pagination or direct usage.