A package. Net2005 library, it is wide, can be used to study

Framework
.........\BusinessLogic
.........\.............\bin
.........\.............\...\Debug
.........\.............\BusinessLogic.csproj
.........\.............\BusinessLogic.csproj.pdsync
.........\.............\BusinessLogic.csproj.user
.........\.............\obj
.........\.............\...\BusinessLogic.csproj.FileList.txt
.........\.............\...\BusinessLogic.csproj.FileListAbsolute.txt
.........\.............\...\Debug
.........\.............\Properties
.........\.............\..........\AssemblyInfo.cs
.........\.............\..........\Resources.Designer.cs
.........\.............\..........\Resources.en.resx
.........\.............\..........\Resources.resx
.........\.............\..........\Resources.zh-CHS.resx
.........\CommonUtilities
.........\...............\ArithmeticHelper.cs
.........\...............\BaseInfo.cs
.........\...............\bin
.........\...............\...\Debug
.........\...............\BS
.........\...............\..\ControlHelper.cs
.........\...............\..\Controls
.........\...............\..\........\DropDownListControl.cs
.........\...............\..\........\FileUploadControl.cs
.........\...............\..\........\GridViewControl.cs
.........\...............\..\........\PanelControl.cs
.........\...............\..\........\TextBoxControl.cs
.........\...............\..\Page
.........\...............\..\....\BasePage.cs
.........\...............\..\....\DataPage_Common.cs
.........\...............\..\....\DataPage_DataBase.cs
.........\...............\..\....\DataPage_Object.cs
.........\...............\..\....\IBasePage.cs
.........\...............\..\....\IDataPage.cs
.........\...............\..\....\ISecurityPage.cs
.........\...............\..\....\SecurityPage.cs
.........\...............\..\ScriptHelper.cs
.........\...............\..\WebHelper.cs
.........\...............\CacheHelper.cs
.........\...............\Common
.........\...............\......\CommonAttribute.cs
.........\...............\......\CommonEnum.cs
.........\...............\......\CommonStruct.cs
.........\...............\......\SmartDate.cs
.........\...............\CommonUtilities.csproj
.........\...............\CommonUtilities.csproj.pdsync
.........\...............\CommonUtilities.csproj.user
.........\...............\ConvertHelper.cs
.........\...............\CryptRandomHelper.cs
.........\...............\CS
.........\...............\..\DialogHelper.cs
.........\...............\..\ThreadHelper.cs
.........\...............\..\WinServiceHelper.cs
.........\...............\Csla
.........\...............\....\BusinessBase.cs
.........\...............\....\Core
.........\...............\....\....\BusinessBase.cs
.........\...............\....\....\IBusinessObject.cs
.........\...............\....\....\IEditableCollection.cs
.........\...............\....\....\IUndoableObject.cs
.........\...............\....\Data
.........\...............\....\DataPortal
.........\...............\....\..........\Client
.........\...............\....\..........\Host
.........\...............\....\..........\Server
.........\...............\....\Security
.........\...............\....\Validation
.........\...............\DataBase
.........\...............\........\DatabaseHelper.cs
.........\...............\........\DataFactory.cs
.........\...............\........\DataMapper.cs
.........\...............\........\IDataBase.cs
.........\...............\........\OleDbHelper.cs
.........\...............\........\OracleHelper.cs
.........\...............\........\QueryBuilder.cs
.........\...............\........\SQLHelper.cs
.........\...............\EncryptHelper.cs
.........\...............\EnumHelper.cs
.........\...............\FileHelper.cs
.........\...............\FusionChartHelper.cs
.........\...............\LogHelper.cs
.........\...............\MediaHandler.cs
.........\...............\NetHelper.cs
.........\...............\obj
.........\...............\...\CommonUtilities.csproj.FileList.txt
.........\...............\...\CommonUtilities.csproj.FileListAbsolute.txt
.........\...............\...\Debug
.

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