The use of three-tier architecture, complete and simple to write the database access account

QQ\db1.mdb
..\Demo\Demo\Demo.suo
..\....\....\Demo.sln
..\....\....\UI\UI.csproj
..\....\....\..\Form1.Designer.cs
..\....\....\..\Form1.resx
..\....\....\..\QQ.cs
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..\....\....\..\...\.....\ResolveAssemblyReference.cache
..\....\....\..\...\.....\UI.csproj.GenerateResource.Cache
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..\....\....\..\...\.....\Maticsoft.DAL.dll
..\....\....\..\...\.....\Maticsoft.DBUtility.dll
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..\....\....\..\...\.....\Maticsoft.Model.pdb
..\....\....\..\...\.....\Maticsoft.DAL.pdb
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..\....\....\...\MySql.Data.dll
..\....\....\...\System.Data.SQLite.DLL
..\....\....\...\Microsoft.Web.UI.WebControls.dll
..\....\....\Lib
..\....\....\BLL\BLL.csproj
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..\....\....\...\QQinfo.cs
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..\....\....\...\...\Debug\Maticsoft.BLL.pdb
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..\....\....\...\...\.....\ResolveAssemblyReference.cache
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..\....\....\...\...\Debug
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..\....\....\...\...\.....\MySql.Data.dll
..\....\....\...\...\.....\System.Data.SQLite.dll
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..\....\....\...\...\.....\Maticsoft.Model.pdb
..\....\....\...\...\.....\Maticsoft.DAL.dll
..\....\....\...\...\.....\Maticsoft.DAL.pdb

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