how to work sql in C#

DBConnectionSample\DBConnectionSample.sln
..................\DBConnectionSample.suo
..................\..................\app.config
..................\..................\DBConnectionSample.csproj
..................\..................\frmConnectToDB.cs
..................\..................\frmConnectToDB.Designer.cs
..................\..................\frmConnectToDB.resx
..................\..................\frmDeleteDB.cs
..................\..................\frmDeleteDB.Designer.cs
..................\..................\frmDeleteDB.resx
..................\..................\frmInserToDB.cs
..................\..................\frmInserToDB.Designer.cs
..................\..................\frmInserToDB.resx
..................\..................\frmUpdateDB.cs
..................\..................\frmUpdateDB.Designer.cs
..................\..................\frmUpdateDB.resx
..................\..................\Program.cs
..................\..................\...perties\AssemblyInfo.cs
..................\..................\..........\Resources.Designer.cs
..................\..................\..........\Resources.resx
..................\..................\..........\Settings.Designer.cs
..................\..................\..........\Settings.settings
..................\..................\obj\Debug\DBConnectionSample.csproj.FileListAbsolute.txt
..................\..................\...\.....\DBConnectionSample.csproj.GenerateResource.Cache
..................\..................\...\.....\DBConnectionSample.exe
..................\..................\...\.....\DBConnectionSample.frmConnectToDB.resources
..................\..................\...\.....\DBConnectionSample.frmDeleteDB.resources
..................\..................\...\.....\DBConnectionSample.frmInserToDB.resources
..................\..................\...\.....\DBConnectionSample.frmUpdateDB.resources
..................\..................\...\.....\DBConnectionSample.pdb
..................\..................\...\.....\DBConnectionSample.Properties.Resources.resources
..................\..................\...\.....\TempPE\SampleDBDataSet.Designer.cs.dll
..................\..................\...\.....\......\SampleDBDataSet1.Designer.cs.dll
..................\..................\...\.....\......\SampleDBDataSet2.Designer.cs.dll
..................\..................\...\.....\......\SampleDBDataSet3.Designer.cs.dll
..................\..................\bin\Debug\DBConnectionSample.exe
..................\..................\...\.....\DBConnectionSample.exe.config
..................\..................\...\.....\DBConnectionSample.pdb
..................\..................\...\.....\DBConnectionSample.vshost.exe
..................\..................\...\.....\DBConnectionSample.vshost.exe.config
..................\..................\...\.....\DBConnectionSample.vshost.exe.manifest
..................\..................\obj\Debug\TempPE
..................\..................\...\.....\Refactor
..................\..................\...\Debug
..................\..................\bin\Debug
..................\..................\Properties
..................\..................\obj
..................\..................\bin
..................\DBConnectionSample
DBConnectionSample

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