将Excel直接当作数据库使用，ASP.NET三层架构

Excel做为数据库登录的三层实现

一个简单的登录验证程序源码，数据库采用的是Excel，利用简单三层实现

DB/users.xls为Excel文件

using System;
using System.Collections.Generic;
using System.Text;
using Model;
using DAL;

namespace BLL
{
   public class Userlogic
    {
        public User Get_User（string sUserName）
        {
            UserAccess ua = new UserAccess（）;
            return（ua.Get_User（sUserName））;
        }
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2015-08-25 10:00  threeExcel\
     目录           0  2015-08-25 10:00  threeExcel\BLL\
     目录           0  2009-04-17 11:20  threeExcel\BLL\bin\
     目录           0  2009-04-17 11:20  threeExcel\BLL\bin\Debug\
     文件        4096  2015-07-28 15:15  threeExcel\BLL\bin\Debug\BLL.dll
     文件       13824  2015-07-28 15:15  threeExcel\BLL\bin\Debug\BLL.pdb
     文件        4608  2015-07-28 15:15  threeExcel\BLL\bin\Debug\DAL.dll
     文件       13824  2015-07-28 15:15  threeExcel\BLL\bin\Debug\DAL.pdb
     文件        4608  2015-07-28 15:07  threeExcel\BLL\bin\Debug\Model.dll
     文件       13824  2015-07-28 15:07  threeExcel\BLL\bin\Debug\Model.pdb
     文件        5120  2015-07-28 15:15  threeExcel\BLL\bin\Debug\SQLHelper.dll
     文件       13824  2015-07-28 15:15  threeExcel\BLL\bin\Debug\SQLHelper.pdb
     文件        2486  2015-07-28 15:05  threeExcel\BLL\BLL.csproj
     目录           0  2009-04-17 11:22  threeExcel\BLL\obj\
     文件         248  2009-03-25 18:43  threeExcel\BLL\obj\BLL.csproj.FileList.txt
     文件         490  2009-04-17 11:33  threeExcel\BLL\obj\BLL.csproj.FileListAbsolute.txt
     目录           0  2015-07-28 15:15  threeExcel\BLL\obj\Debug\
     文件         754  2015-07-28 15:07  threeExcel\BLL\obj\Debug\BLL.csproj.FileListAbsolute.txt
     文件        4096  2015-07-28 15:15  threeExcel\BLL\obj\Debug\BLL.dll
     文件       13824  2015-07-28 15:15  threeExcel\BLL\obj\Debug\BLL.pdb
     文件        7794  2015-07-28 15:15  threeExcel\BLL\obj\Debug\ResolveAssemblyReference.cache
     目录           0  2009-04-17 11:20  threeExcel\BLL\obj\Debug\TempPE\
     目录           0  2009-04-17 11:20  threeExcel\BLL\Properties\
     文件        1319  2009-03-23 14:02  threeExcel\BLL\Properties\AssemblyInfo.cs
     文件         322  2015-08-25 10:00  threeExcel\BLL\Userlogic.cs
     目录           0  2009-04-17 11:20  threeExcel\DAL\
     目录           0  2009-04-17 11:20  threeExcel\DAL\bin\
     目录           0  2009-04-17 11:20  threeExcel\DAL\bin\Debug\
     文件        4608  2015-07-28 15:15  threeExcel\DAL\bin\Debug\DAL.dll
     文件       13824  2015-07-28 15:15  threeExcel\DAL\bin\Debug\DAL.pdb
     文件        4608  2015-07-28 15:07  threeExcel\DAL\bin\Debug\Model.dll
............此处省略84个文件信息