A typical three-tier structure of the database connection, for beginners to understand the database connectivity and storage

ThreeLayerDemo
..............\Code
..............\....\ThreeLayerDemo
..............\....\..............\app.config
..............\....\..............\bin
..............\....\..............\...\Debug
..............\....\..............\...\.....\ThreeLayerDemo.exe
..............\....\..............\...\.....\ThreeLayerDemo.exe.config
..............\....\..............\...\.....\ThreeLayerDemo.vshost.exe
..............\....\..............\...\.....\ThreeLayerDemo.vshost.exe.config
..............\....\..............\BUS
..............\....\..............\...\userBUS.cs
..............\....\..............\DAO
..............\....\..............\...\userDAO.cs
..............\....\..............\dbConnection.cs
..............\....\..............\frmLogin.cs
..............\....\..............\frmLogin.Designer.cs
..............\....\..............\frmLogin.resx
..............\....\..............\Program.cs
..............\....\..............\Properties
..............\....\..............\..........\AssemblyInfo.cs
..............\....\..............\..........\Resources.Designer.cs
..............\....\..............\..........\Resources.resx
..............\....\..............\..........\Settings.Designer.cs
..............\....\..............\..........\Settings.settings
..............\....\..............\ThreeLayerDemo.csproj
..............\....\..............\ThreeLayerDemo.csproj.user
..............\....\..............\VO
..............\....\..............\..\userVO.cs
..............\....\ThreeLayerDemo.sln
..............\....\ThreeLayerDemo.suo

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