This procedure is not a complete system, it only provides a simple login feature, which is my elective teachers are leaving the job, the reasons for publishing and open source is to allow C# to beginners can be faster entry, or want to know the three-tier friends give some reference. It is written in VS.NET 2005, the source structure is clear, and with a comment. Believed able to just learn C# and would like to know the three-tier students to help.

20071920285172\3\3.sln
..............\.\3.suo
..............\.\DataSource\bin\Debug\DataSource.dll
..............\.\..........\...\.....\DataSource.pdb
..............\.\..........\...\Debug
..............\.\..........\bin
..............\.\..........\Database.xml
..............\.\..........\DataSource.cs
..............\.\..........\DataSource.csproj
..............\.\..........\DESEncrypt.cs
..............\.\..........\obj\DataSource.csproj.FileList.txt
..............\.\..........\...\.ebug\DataSource.dll
..............\.\..........\...\.....\DataSource.pdb
..............\.\..........\...\.....\Refactor\DataSource.dll
..............\.\..........\...\.....\Refactor
..............\.\..........\...\.....\TempPE
..............\.\..........\...\Debug
..............\.\..........\...\Release\DataSource.dll
..............\.\..........\...\.......\DataSource.pdb
..............\.\..........\...\.......\TempPE
..............\.\..........\...\Release
..............\.\..........\obj
..............\.\..........\Properties\AssemblyInfo.cs
..............\.\..........\Properties
..............\.\DataSource
..............\.\DESMD5.exe
..............\.\Logic\bin\Debug\DataSource.dll
..............\.\.....\...\.....\DataSource.pdb
..............\.\.....\...\.....\Logic.dll
..............\.\.....\...\.....\Logic.pdb
..............\.\.....\...\Debug
..............\.\.....\bin
..............\.\.....\Logic.csproj
..............\.\.....\LoginAction.cs
..............\.\.....\MD5.cs
..............\.\.....\obj\Debug\Logic.dll
..............\.\.....\...\.....\Logic.pdb
..............\.\.....\...\.....\Refactor\Logic.dll
..............\.\.....\...\.....\........\Logics.dll
..............\.\.....\...\.....\Refactor
..............\.\.....\...\.....\ResolveAssemblyReference.cache
..............\.\.....\...\.....\TempPE
..............\.\.....\...\Debug
..............\.\.....\...\Logic.csproj.FileList.txt
..............\.\.....\...\Release\Logic.dll
..............\.\.....\...\.......\Logic.pdb
..............\.\.....\...\.......\ResolveAssemblyReference.cache
..............\.\.....\...\.......\TempPE
..............\.\.....\...\Release
..............\.\.....\obj
..............\.\.....\Properties\AssemblyInfo.cs
..............\.\.....\Properties
..............\.\Logic
..............\.\View\bin\Debug\data.mdb
..............\.\....\...\.....\Database.xml
..............\.\....\...\.....\DataSource.dll
..............\.\....\...\.....\DataSource.pdb
..............\.\....\...\.....\Logic.dll
..............\.\....\...\.....\Logic.pdb
..............\.\....\...\.....\View.exe
..............\.\....\...\.....\View.pdb
..............\.\....\...\.....\View.vshost.exe
..............\.\....\...\Debug
..............\.\....\bin
..............\.\....\it.ico
..............\.\....\Loginfrm.cs
..............\.\....\Loginfrm.Designer.cs
..............\.\....\Loginfrm.resx
..............\.\....\MainFrm.cs
..............\.\....\MainFrm.Designer.cs
..............\.\....\MainFrm.resx
..............\.\....\obj\Debug\Login.View.Loginfrm.resources
..............\.\....\...\.....\Login.View.MainFrm.resources
..............\.\....\...\.....\Login.View.Properties.Resources.resources
..............\.\....\...\.....\Refactor
..............\.\....\...\.....\ResolveAssemblyReference.cache
..............\.\....\...\.....\TempPE\Properties.Resources.Designer.cs.dll
..............\.\....\...\.....\TempPE
..............\.\....\...\.....\View.csproj.GenerateResource.Cache
..............\.\....\...\.....\View.exe
..............\.\....\...\.....\View.pdb
..............\.\....\...\Debug
..............\.\....\...\Release\Login.View.Loginfrm.resources
..............\.\....\...\.......\Login.View.MainFrm.resources
..............\.\....\...\.......\Login.View.Properties.Resources.resources
..............\.\....\...\.......\ResolveAssemblyReference.cache
..............\.\....\...\.......\TempPE\Properties.Resources.Designer.cs.dll
..............\.\....\...\.......\TempPE
..............\.\....\...\.......\View.csproj.GenerateResource.Cache
..............\.\....\...\.......\View.exe
..............\.\....\...\.

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