using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Collections;/// <summary>/// Page helper, default page size = 10/// </summary>/// <typeparam name="T"></typeparam>/// <typeparam name="entity"></typeparam>public class LinqPageHelper<T, entity> where T : IEnumerable<entity>{    T _collection;    int _pageCount;    int _pageSize;    public static readonly int defaultPageSize = 10;    /// <summary>    /// Capacity of a single page    /// </summary>    public int PageSize    {        get { return _pageSize; }        set        {            _pageSize = value;            onPageSizeChanged();        }    }    /// <summary>    /// Total page count    /// </summary>    public int PageCount    {        get        {            return _pageCount;        }        set        {            _pageCount = value;        }    }    /// <summary>    /// Total count    /// </summary>    public int Count    {        get { return _collection.Count(); }    }    private LinqPageHelper()    {    }    public LinqPageHelper(T t)        : this(t, defaultPageSize)    {    }    public LinqPageHelper(T t, int pageSize)    {        _collection = t;        _pageSize = pageSize;        onPageSizeChanged();    }    private void onPageSizeChanged()    {        _pageCount = (_collection.Count() - 1 + _pageSize) / _pageSize;    }    public IEnumerable<entity> Take(int currentPage)    {        if (currentPage <= 0 || currentPage > PageCount)        {            return null;        }        var query =            _collection.Take(_pageSize * currentPage).Skip(_pageSize * (currentPage - 1));        return query;    }    public bool IsLastPage(int currentPage)    {        return currentPage == _pageCount;    }}

            LinqPageHelper<IEnumerable<DataEntity>, DataEntity> helper =                new LinqPageHelper<IEnumerable<DataEntity>, DataEntity>(list);            helper.PageSize = pageSize;            var result = helper.Take(currentPage);