Its functioni is to operate the database when it can connect to the database

Example_ch09
............\Exp9_1
............\......\Exp9_1
............\......\......\bin
............\......\......\...\Debug
............\......\......\...\.....\Exp9_1.exe
............\......\......\...\.....\Exp9_1.pdb
............\......\......\...\.....\Exp9_1.vshost.exe
............\......\......\...\.....\Exp9_1.vshost.exe.manifest
............\......\......\Exp9_1.csproj
............\......\......\Form1.cs
............\......\......\Form1.Designer.cs
............\......\......\Form1.resx
............\......\......\obj
............\......\......\...\Debug
............\......\......\...\.....\Exp9_1.csproj.FileListAbsolute.txt
............\......\......\...\.....\Exp9_1.csproj.GenerateResource.Cache
............\......\......\...\.....\Exp9_1.exe
............\......\......\...\.....\Exp9_1.pdb
............\......\......\...\.....\TempPE
............\......\......\...\.....\......\Properties.Resources.Designer.cs.dll
............\......\......\Program.cs
............\......\......\Properties
............\......\......\..........\AssemblyInfo.cs
............\......\......\..........\Resources.Designer.cs
............\......\......\..........\Resources.resx
............\......\......\..........\Settings.Designer.cs
............\......\......\..........\Settings.settings
............\......\Exp9_1.sln
............\......\Exp9_1.suo
............\Exp9_2
............\......\Exp9_2
............\......\......\bin
............\......\......\...\Debug
............\......\......\...\.....\Exp9_2.exe
............\......\......\...\.....\Exp9_2.pdb
............\......\......\...\.....\Exp9_2.vshost.exe
............\......\......\...\.....\Exp9_2.vshost.exe.manifest
............\......\......\Exp9_2.csproj
............\......\......\Form1.cs
............\......\......\Form1.Designer.cs
............\......\......\Form1.resx
............\......\......\obj
............\......\......\...\Debug
............\......\......\...\.....\Exp9_2.csproj.FileListAbsolute.txt
............\......\......\...\.....\Exp9_2.csproj.GenerateResource.Cache
............\......\......\...\.....\Exp9_2.exe
............\......\......\...\.....\Exp9_2.Form1.resources
............\......\......\...\.....\Exp9_2.pdb
............\......\......\...\.....\Exp9_2.Properties.Resources.resources
............\......\......\...\.....\Refactor
............\......\......\...\.....\TempPE
............\......\......\...\.....\......\Properties.Resources.Designer.cs.dll
............\......\......\Program.cs
............\......\......\Properties
............\......\......\..........\AssemblyInfo.cs
............\......\......\..........\Resources.Designer.cs
............\......\......\..........\Resources.resx
............\......\......\..........\Settings.Designer.cs
............\......\......\..........\Settings.settings
............\......\Exp9_2.sln
............\......\Exp9_2.suo
............\Exp9_3
............\......\Exp9_3
............\......\......\bin
............\......\......\...\Debug
............\......\......\...\.....\Exp9_3.exe
............\......\......\...\.....\Exp9_3.pdb
............\......\......\...\.....\Exp9_3.vshost.exe
............\......\......\...\.....\Exp9_3.vshost.exe.manifest
............\......\......\Exp9_3.csproj
............\......\......\Form1.cs
............\......\......\Form1.Designer.cs
............\......\......\Form1.resx
............\......\......\obj
............\......\......\...\Debug
............\......\......\...\.....\Exp9_3.csproj.FileListAbsolute.txt
............\......\......\...\.....\Exp9_3.csproj.GenerateResource.Cache
............\......\......\...\.....\Exp9_3.exe
............\......\......\...\.....\Exp9_3.Form1.resources
............\......\......\...\.....\Exp9_3.pdb
............\......\......\...\.....\Exp9_3.Properties.Resources.resources
............\......\......\...\.....\TempPE
............\......\......\...\.....\......\Properties.Resources.Designer.cs.dll
............\......\......\Program.cs
............\......\......\Properties
............\......\......\..........\AssemblyInfo.cs
............\.....

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