I have developed a three-tier framework for database access, using a centralized model commonly used for development. Should be able to meet the minimum requirements, for beginners to help Tingda s.

LB
..\ConsoleApplication1
..\...................\ADO.cs
..\...................\bin
..\...................\...\Debug
..\...................\ConsoleApplication1.csproj
..\...................\extendsADO.cs
..\...................\obj
..\...................\...\ConsoleApplication1.csproj.FileList.txt
..\...................\...\Debug
..\...................\...\.....\TempPE
..\...................\Program.cs
..\...................\Properties
..\...................\..........\AssemblyInfo.cs
..\ConsoleApplication2
..\...................\bin
..\...................\...\Debug
..\...................\...\.....\ConsoleApplication2.exe
..\...................\...\.....\ConsoleApplication2.exe.config
..\...................\...\.....\ConsoleApplication2.pdb
..\...................\...\.....\ConsoleApplication2.vshost.exe
..\...................\...\.....\ConsoleApplication2.vshost.exe.config
..\...................\...\.....\LB.dll
..\...................\...\.....\LB.pdb
..\...................\ConsoleApplication2.csproj
..\...................\DBUtility
..\...................\.........\AdapterDBUtility.cs
..\...................\.........\ADODBUtility.cs
..\...................\.........\App.config
..\...................\.........\Model.cs
..\...................\.........\ReaderDBUtility.cs
..\...................\obj
..\...................\...\ConsoleApplication2.csproj.FileList.txt
..\...................\...\Debug
..\...................\...\.....\build.force
..\...................\...\.....\ConsoleApplication2.exe
..\...................\...\.....\ConsoleApplication2.pdb
..\...................\...\.....\ResolveAssemblyReference.cache
..\...................\...\.....\TempPE
..\...................\Program.cs
..\...................\Properties
..\...................\..........\AssemblyInfo.cs
..\LB
..\..\App_Common
..\..\..........\Common.cs
..\..\bin
..\..\...\Debug
..\..\...\.....\LB.dll
..\..\...\.....\LB.dll.config
..\..\...\.....\LB.pdb
..\..\DBUtility
..\..\.........\AdapterDBUtility.cs
..\..\.........\ADODBUtility.cs
..\..\.........\App.config
..\..\.........\Model.cs
..\..\.........\ReaderDBUtility.cs
..\..\LB.csproj
..\..\obj
..\..\...\Debug
..\..\...\.....\LB.dll
..\..\...\.....\LB.pdb
..\..\...\.....\Refactor
..\..\...\.....\TempPE
..\..\...\LB.csproj.FileList.txt
..\..\Properties
..\..\..........\AssemblyInfo.cs
..\..\WebUI
..\..\.....\AJAX
..\..\.....\....\AjaxObjectHelp.cs
..\..\.....\Base
..\..\.....\....\BaseTools.cs
..\LB.sln

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