At. Net on how to establish a data connection factory to a more flexible and convenient access to data

数据连接工厂\ConnectedClassesTest\01ConnectedClassesTest.csproj
............\....................\01ConnectedClassesTest.sln
............\....................\01ConnectedClassesTest.suo
............\....................\App.config
............\....................\bin\Debug\ConnectedClassesTest.exe
............\....................\...\.....\ConnectedClassesTest.exe.config
............\....................\...\.....\ConnectedClassesTest.pdb
............\....................\...\.....\ConnectedClassesTest.vshost.exe
............\....................\...\.....\ConnectedClassesTest.vshost.exe.config
............\....................\...\.....\PUBS.MDF
............\....................\...\.....\PUBS_LOG.LDF
............\....................\DataAccess.cs
............\....................\Form1.cs
............\....................\Form1.Designer.cs
............\....................\Form1.resx
............\....................\frmProviderFactories.cs
............\....................\frmProviderFactories.Designer.cs
............\....................\frmProviderFactories.resx
............\....................\frmSources.cs
............\....................\frmSources.Designer.cs
............\....................\frmSources.resx
............\....................\obj\01ConnectedClassesTest.csproj.FileList.txt
............\....................\...\01ConnectedClassesTest.csproj.FileListAbsolute.txt
............\....................\...\ConnectedClassesTest.csproj.FileList.txt
............\....................\...\Debug\01ConnectedClassesTest.csproj.GenerateResource.Cache
............\....................\...\.....\ConnectedClassesTest.csproj.GenerateResource.Cache
............\....................\...\.....\ConnectedClassesTest.exe
............\....................\...\.....\ConnectedClassesTest.Form1.resources
............\....................\...\.....\ConnectedClassesTest.frmProviderFactories.resources
............\....................\...\.....\ConnectedClassesTest.frmSources.resources
............\....................\...\.....\ConnectedClassesTest.pdb
............\....................\...\.....\ConnectedClassesTest.Properties.Resources.resources
............\....................\...\.....\TempPE\Properties.Resources.Designer.cs.dll
............\....................\Program.cs
............\....................\...perties\AssemblyInfo.cs
............\....................\..........\Resources.Designer.cs
............\....................\..........\Resources.resx
............\....................\..........\Settings.Designer.cs
............\....................\..........\Settings.settings
............\....................\obj\Debug\TempPE
............\....................\bin\Debug
............\....................\obj\Debug
............\....................\bin
............\....................\obj
............\....................\Properties
............\ConnectedClassesTest
数据连接工厂

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