Business layered Heirarchy

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DataAccess - Data Layer (Models and Contexts are present here)

• Migration commands are executed in this layer

CompanyService - Service Layer (Business Logic is implemented in here)

• This layer uses models to access data from db

WebApi - Presentation layer (Here the logic is consumed and data is fed to the UI)

• Controllers are present here
• We add reference to above two layers in this project

Layer Structure

.
├── DataAccess
│   ├── Context
│   │   └── WorkDBContext.cs                   
│   ├── Migrations
│   └── Models
│       ├── Department.cs
│       └── Employee.cs
├── CompanyService
│   ├── Interfaces
│   │   ├── IDepartmentService.cs
│   │   └── IEmployeeService.cs
│   └── Services 
│       ├── DepartmentService.cs
│       └── EmployeeService.cs
├── WebAPI                  
│   ├── Controllers
│   │   ├── DepartmentController.cs
│   │   └── EmployeeController.cs
│   ├── Photos 
│   ├── Properties 
│   │   └── launchSettings.cs
│   ├── Program.cs
│   ├── Startup.cs      
│   └── appsettings.json               
└── ...

Observed Issue

• Build fail because of namespace not found issues
  • Reference the DataAccess.dll and CompanyService.dll for WebAPI Project from RefDll folder inside WebAPI Project
  • Reference to the DataAccess.dll for CompanyService Project from same folder
• Database connection error or Object not found error
  • Run Update-database command from nuget package manager console, Selecting the DataAccess Project from Dropdown of the console