c# sql login production, modification, entry interface

StuManagement
.............\StuManagement
.............\.............\DBOperation.cs
.............\.............\Program.cs
.............\.............\Properties
.............\.............\..........\AssemblyInfo.cs
.............\.............\..........\Resources.Designer.cs
.............\.............\..........\Resources.resx
.............\.............\..........\Settings.Designer.cs
.............\.............\..........\Settings.settings
.............\.............\StuManagement.csproj
.............\.............\bin
.............\.............\...\Debug
.............\.............\...\.....\StuManagement.exe
.............\.............\...\.....\StuManagement.pdb
.............\.............\...\.....\StuManagement.vshost.exe
.............\.............\frmAddUser.Designer.cs
.............\.............\frmAddUser.cs
.............\.............\frmAddUser.resx
.............\.............\frmLogin.Designer.cs
.............\.............\frmLogin.cs
.............\.............\frmLogin.resx
.............\.............\frmModifyUser.Designer.cs
.............\.............\frmModifyUser.cs
.............\.............\frmModifyUser.resx
.............\.............\frmUserList.Designer.cs
.............\.............\frmUserList.cs
.............\.............\frmUserList.resx
.............\.............\obj
.............\.............\...\Debug
.............\.............\...\.....\Refactor
.............\.............\...\.....\StuManagement.Properties.Resources.resources
.............\.............\...\.....\StuManagement.csproj.GenerateResource.Cache
.............\.............\...\.....\StuManagement.exe
.............\.............\...\.....\StuManagement.frmAddUser.resources
.............\.............\...\.....\StuManagement.frmLogin.resources
.............\.............\...\.....\StuManagement.frmModifyUser.resources
.............\.............\...\.....\StuManagement.frmUserList.resources
.............\.............\...\.....\StuManagement.pdb
.............\.............\...\.....\TempPE
.............\.............\...\StuManagement.csproj.FileListAbsolute.txt
.............\StuManagement.sln
.............\StuManagement.suo
.............\stuManagement.mdf
.............\stuManagement_log.ldf

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