Introduction

In today’s complex business environments, having an integrated administrative and financial system is essential for ensuring efficient and transparent operations. This article explains how to design a web application hosted on IIS (Internet Information Services) on Windows Server using C#. The system will manage both administrative and financial operations while ensuring data security and preventing unauthorized modifications.

System Overview

Main Goals

1. Complete employee management from hiring to termination
2. Hierarchical permission system matching the organizational structure
3. Complete document workflow for employee leave requests
4. Daily task and performance monitoring
5. Financial compensation and incentive management
6. Detailed reports for senior management

Technical Architecture

1. Development and Deployment Environment

• Server: Windows Server with IIS 10 or higher
• Programming Language: C# with ASP.NET MVC framework
• Database: SQL Server with encryption enabled
• Authentication: Windows Authentication integrated with Active Directory

2. Project Structure

HR-Finance-System/
├── Controllers/
│   ├── AccountController.cs
│   ├── EmployeeController.cs
│   ├── LeaveController.cs
│   ├── FinanceController.cs
│   └── ReportController.cs
├── Models/
├── Views/
├── Services/
├── Security/
└── Data/

Permission and Security System

Permission Model Design

public class Permission
{
    public int PermissionId { get; set; }
    public string ModuleName { get; set; }
    public bool CanView { get; set; }
    public bool CanCreate { get; set; }
    public bool CanApprove { get; set; }
    public bool CanDelete { get; set; }
}

public class Role
{
    public int RoleId { get; set; }
    public string RoleName { get; set; } // Department, Division, Employee
    public List<Permission> Permissions { get; set; }
}

Preventing Unauthorized Modifications

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class)]
public class AuditLogAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        // Log all modification attempts
        var userName = filterContext.HttpContext.User.Identity.Name;
        var action = filterContext.ActionDescriptor.ActionName;
        var controller = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName;

        AuditService.Log(userName, controller, action, DateTime.Now);

        base.OnActionExecuted(filterContext);
    }
}

Main System Modules

1. Employee Management Module

• Basic employee data: Personal information, qualifications, experience
• Career tracking: Promotions, transfers, training
• Attendance system: Integration with fingerprint systems
• Performance evaluation: Regular assessments with standard metrics

2. Leave Management Module

public class LeaveRequest
{
    public int LeaveId { get; set; }
    public int EmployeeId { get; set; }
    public LeaveType Type { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public string Reason { get; set; }
    public string AttachmentPath { get; set; }
    public LeaveStatus Status { get; set; }
    public List<Approval> Approvals { get; set; }
}

public enum LeaveStatus
{
    Pending,
    ApprovedByManager,
    ApprovedByHR,
    Rejected,
    Cancelled
}

3. Financial Compensation Module

• Basic salary calculation: Based on grade and base salary
• Overtime calculations: Automatic calculations based on attendance records
• Bonuses and incentives: Linked to performance evaluation
• Deductions: Legal and disciplinary deductions

4. Reporting and Monitoring Module

• Custom dashboards: For each management level
• Interactive reports: With filtering and export capabilities
• Automatic alerts: For violations and exceptions

Technical Challenges and Solutions

Challenge 1: Difficult Work Environment

Solution: Design simple interfaces that work with intermittent connectivity

public class OfflineSyncService
{
    public void SyncPendingOperations()
    {
        // Sync pending operations when connection is restored
        var pendingOperations = GetPendingOperations();
        foreach (var operation in pendingOperations)
        {
            ProcessOperation(operation);
        }
    }
}

Challenge 2: Complex Leave Workflow

Solution: Flexible, configurable workflow engine

public class WorkflowEngine
{
    public ApprovalProcess CreateLeaveApprovalProcess(Employee employee)
    {
        var process = new ApprovalProcess();

        // Build workflow dynamically based on company policy
        if (employee.Department == "Management")
            process.AddStep(new DirectorApproval());
        else
            process.AddStep(new ManagerApproval());

        process.AddStep(new HRApproval());
        return process;
    }
}

Challenge 3: Security and Tamper Prevention

Solution: Multi-level verification system

[Authorize(Roles = "FinanceManager")]
[AuditLog]
public class FinanceController : Controller
{
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult UpdateSalary(EmployeeSalary model)
    {
        if (!ModelState.IsValid)
            return View(model);

        // Additional policy verification
        if (!SalaryPolicy.CanUpdate(User, model))
            return new HttpStatusCodeResult(403);

        _salaryService.UpdateSalary(model);
        return RedirectToAction("Index");
    }
}

Advanced System Features

1. Notification System

• Instant notifications for pending approvals
• Deadline alerts
• Salary and incentive notifications

2. Email and Integration

• Automatic confirmation emails
• Integration with internal mail system
• SMS notifications for critical operations

3. Backup and Recovery

• Automatic daily backups
• Data recovery capability
• Complete audit logs

Performance Considerations

Database Performance Optimization

public class OptimizedQueryService
{
    public PagedResult<Employee> GetEmployees(int page, int pageSize)
    {
        using (var context = new HRContext())
        {
            return context.Employees
                .Include(e => e.Department)
                .Include(e => e.Position)
                .OrderBy(e => e.LastName)
                .ToPagedResult(page, pageSize);
        }
    }
}

Handling Concurrent Load

• Use Output Caching for static data
• Implement caching patterns
• Load balancing across multiple servers

Conclusion

The proposed system offers a complete solution for financial and administrative management in complex work environments, focusing on:

1. Security: Through strict permission systems and audit logs
2. Flexibility: In handling changing policies and procedures
3. Efficiency: In managing daily operations and financial transactions
4. Transparency: In tracking performance and operations

The system’s success depends on careful deployment planning, training, and continuous technical support, while ensuring full compliance with company policies and regulations.

Future Recommendations

1. Mobile app support
2. Integration with existing ERP systems
3. Predictive analytics using AI
4. Multi-language support for international companies

This system represents a strategic investment in transforming administrative and financial processes into effective digital operations, contributing to improved productivity and informed decision-making.