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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a Korean Enterprise GroupWare system built with C# .NET Framework 4.6 and Windows Forms. The application serves as a comprehensive business management system that includes project management, purchasing, attendance tracking, reporting, and web-based functionality. The project runs on port 7979 (previously 9000) and includes both desktop and web components.
+
+## Architecture
+
+### Main Application (Project/EETGW.csproj)
+- **Entry Point**: `Project/Program.cs` - Handles WebView2Runtime extraction and starts the main form
+- **Main Form**: `Project/fMain.cs` - Primary application window
+- **Web Server**: Integrated OWIN-based web server for HTTP API and static files
+- **Database**: Microsoft SQL Server with Entity Framework 6.2.0
+- **Target Framework**: .NET Framework 4.6
+
+### Key Components
+
+1. **Web Layer** (`Project/Web/`):
+   - **Startup.cs**: OWIN configuration for HTTP API and static file serving
+   - **Controllers**: API controllers for various business functions (Home, Project, Purchase, Item, etc.)
+   - **wwwroot**: Static web assets (HTML, CSS, JS files)
+
+2. **SubProjects**: Modular components with specific business functionality:
+   - **FPJ0000**: Project management module
+   - **FCM0000**: Customer management
+   - **FEQ0000**: Equipment management  
+   - **FBS0000**: Holiday/attendance management
+   - **FCOMMON**: Shared common functionality
+   - **WebServer**: Additional web services
+   - **AmkorRestfulService**: REST API services
+
+3. **Sub Components** (`Sub/`):
+   - **arCtl**: Custom controls library
+   - **arftp**: FTP functionality
+   - **tcpservice**: TCP communication services
+   - **YARTE**: HTML editor component
+   - **StaffLayoutCtl**: Staff layout controls
+
+### Technology Stack
+- **UI Framework**: Windows Forms with custom controls (FarPoint Spread grids)
+- **Web Framework**: OWIN with ASP.NET Web API 5.2.9
+- **Database ORM**: Entity Framework 6.2.0
+- **JSON Processing**: Newtonsoft.Json 13.0.3
+- **Web Browser**: Microsoft WebView2 1.0.2210.55
+- **Reports**: Microsoft ReportViewer 15.0
+- **Excel Processing**: libxl.net and CsvHelper 30.0.1
+
+## Development Commands
+
+### Building the Solution
+```bash
+# Build the entire solution
+msbuild EETGW.sln /p:Configuration=Debug /p:Platform="Any CPU"
+
+# Build for release
+msbuild EETGW.sln /p:Configuration=Release /p:Platform="Any CPU"
+
+# Build specific project
+msbuild Project/EETGW.csproj /p:Configuration=Debug
+```
+
+### Running the Application
+- **Debug Mode**: Run from Visual Studio or build and execute the output from `Project/bin/Debug/`
+- **Web Server**: Automatically starts on port 7979 when the application launches
+- **Database**: Ensure SQL Server connection string is configured in app.config
+
+### Package Management
+- Uses NuGet packages defined in `packages.config` files throughout the solution
+- Restore packages using: `nuget restore EETGW.sln`
+
+## Configuration
+
+### Database Connection
+- Connection strings configured in individual `app.config` files
+- Primary database connection in `Project/app.config`
+- Uses Entity Framework with SQL Server
+
+### Web Server Configuration
+- **Port**: 7979 (configured in startup)
+- **Static Files**: Served from `Project/Web/wwwroot/`
+- **API Routes**: Configured in `Project/Web/Startup.cs`
+- **CORS**: Enabled for all origins
+
+### Build Configurations
+- **Debug**: Outputs to `Project/bin/Debug/` with x86 platform target
+- **Release**: Optimized build configuration
+- Different output paths for various configurations (see EETGW.csproj)
+
+## Key Conventions
+
+### Code Organization
+- Korean comments and variable names are common throughout the codebase
+- Business logic separated into modular SubProjects
+- Shared functionality centralized in FCOMMON project
+- Custom controls and utilities in Sub/ directory
+
+### File Structure
+- Each SubProject has its own namespace and assembly
+- Form files follow naming convention: `f[FormName].cs` with corresponding `.Designer.cs` and `.resx`
+- Dataset files use `.xsd` schemas with generated code
+
+### Dependencies
+- Heavy use of FarPoint Spread controls for data grids
+- Custom logging via ArLog.Net4.dll
+- Settings management through ArSetting.Net4.dll
+- Multiple third-party libraries for Excel, FTP, and web functionality
+
+## Development Notes
+
+- WebView2Runtime is automatically extracted on first run from WebView2Runtime.zip
+- The application includes comprehensive error handling and logging
+- Multiple authentication methods including AD integration
+- Supports both Korean and English localization
+- Includes extensive reporting capabilities with RDLC files