ADO.net SQL database basic operation, supermarket goods classified management

supermarket
...........\DB
...........\..\SuperMarket.mdf
...........\..\SuperMarket_log.ldf
...........\SuperMarket
...........\...........\SuperMarket
...........\...........\...........\bin
...........\...........\...........\...\Debug
...........\...........\...........\obj
...........\...........\...........\...\Debug
...........\...........\...........\...\SuperMarket.csproj.FileList.txt
...........\...........\...........\...\SuperMarket.csproj.FileListAbsolute.txt
...........\...........\...........\Program.cs
...........\...........\...........\Properties
...........\...........\...........\..........\AssemblyInfo.cs
...........\...........\...........\..........\Resources.Designer.cs
...........\...........\...........\..........\Resources.resx
...........\...........\...........\..........\Settings.Designer.cs
...........\...........\...........\..........\Settings.settings
...........\...........\...........\SearchGoodsForm.cs
...........\...........\...........\SearchGoodsForm.designer.cs
...........\...........\...........\SearchGoodsForm.resx
...........\...........\...........\SuperMarket.csproj
...........\...........\SuperMarket.sln

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