In the framework of VS2005.NET C#, use the abstract factory pattern to develop a database of three-tier architecture based on the application log of the small but complete: 1 run after the main window has two text boxes and a button, text boxes were used to enter a user name and password, which password is displayed as*. Button text is "Login" function is to query the database to determine the adoption of the current user name and password are correct, if the right pop-up "login successful" dialog box if the failure of the pop-up "login failed" dialog box. 2 use OOP to achieve the three-tier structure. 3 the application of the abstract factory pattern, making the program can access the SQL database can also visit the ACCESS database, access to different database configuration file by modifying the configuration of the realization. 4 registry database user name and password are sa.

Test
....\Test
....\....\App.config
....\....\bin
....\....\...\Debug
....\....\...\.....\Test.BLL.dll
....\....\...\.....\Test.BLL.pdb
....\....\...\.....\Test.DAL.dll
....\....\...\.....\Test.DAL.pdb
....\....\...\.....\Test.DALFactory.dll
....\....\...\.....\Test.DALFactory.pdb
....\....\...\.....\Test.exe
....\....\...\.....\Test.exe.config
....\....\...\.....\Test.IDAL.dll
....\....\...\.....\Test.IDAL.pdb
....\....\...\.....\Test.Models.dll
....\....\...\.....\Test.Models.pdb
....\....\...\.....\Test.pdb
....\....\...\.....\Test.vshost.exe
....\....\...\.....\Test.vshost.exe.config
....\....\LoginForm.cs
....\....\LoginForm.Designer.cs
....\....\LoginForm.resx
....\....\obj
....\....\...\Debug
....\....\...\.....\Refactor
....\....\...\.....\ResolveAssemblyReference.cache
....\....\...\.....\TempPE
....\....\...\.....\......\Properties.Resources.Designer.cs.dll
....\....\...\.....\Test.csproj.GenerateResource.Cache
....\....\...\.....\Test.exe
....\....\...\.....\Test.LoginForm.resources
....\....\...\.....\Test.pdb
....\....\...\.....\Test.Properties.Resources.resources
....\....\...\Test.csproj.FileList.txt
....\....\Program.cs
....\....\Properties
....\....\..........\AssemblyInfo.cs
....\....\..........\Resources.Designer.cs
....\....\..........\Resources.resx
....\....\..........\Settings.Designer.cs
....\....\..........\Settings.settings
....\....\Resourse


....\....\Test.csproj
....\Test.sln
....\TestBLL
....\.......\bin
....\.......\...\Debug
....\.......\...\.....\Test.BLL.dll
....\.......\...\.....\Test.BLL.pdb
....\.......\...\.....\Test.DAL.dll
....\.......\...\.....\Test.DAL.pdb
....\.......\...\.....\Test.DALFactory.dll
....\.......\...\.....\Test.DALFactory.pdb
....\.......\...\.....\Test.IDAL.dll
....\.......\...\.....\Test.IDAL.pdb
....\.......\...\.....\Test.Models.dll
....\.......\...\.....\Test.Models.pdb
....\.......\obj
....\.......\...\Debug
....\.......\...\.....\Refactor
....\.......\...\.....\........\Test.BLL.dll
....\.......\...\.....\ResolveAssemblyReference.cache
....\.......\...\.....\TempPE
....\.......\...\.....\Test.BLL.dll
....\.......\...\.....\Test.BLL.pdb
....\.......\...\TestBLL.csproj.FileList.txt
....\.......\Properties
....\.......\..........\AssemblyInfo.cs
....\.......\TestBLL.csproj
....\.......\UsersManager.cs
....\TestDAL
....\.......\Access
....\.......\......\UsersService.cs
....\.......\bin
....\.......\...\Debug
....\.......\...\.....\Test.DAL.dll
....\.......\...\.....\Test.DAL.pdb
....\.......\...\.....\Test.IDAL.dll
....\.......\...\.....\Test.IDAL.pdb
....\.......\...\.....\Test.Models.dll
....\.......\...\.....\Test.Models.pdb
....\.......\obj
....\.......\...\Debug
....\.......\...\.....\Refactor
....\.......\...\.....\........\Test.DAL.dll
....\.......\...\.....\ResolveAssemblyReference.cache
....\.......\...\.....\TempPE
....\.......\...\.....\Test.DAL.dll
....\.......\...\.....\Test.DAL.pdb
....\.......\...\TestDAL.csproj.FileList.txt
....\.......\Properties
....\.......\..........\AssemblyInfo.cs
....\.......\SqlServer
....\.......\.........\UsersService.cs
....\.......\TestDAL.csproj
....\TestDALFactory
....\..............\AbstractDALFactory.cs

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