Add project files.

Business/Abstract/ICarService.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Entities.Concrete;
+
+namespace Business.Abstract
+{
+    public interface ICarService
+    {
+        Car GetById(int id);
+
+        List<Car> GetAll();
+
+        void Add(Car car);
+
+        void Update(Car car);
+
+        void Delete(Car car);
+    }
+}

Business/Business.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DataAccess\DataAccess.csproj" />
+    <ProjectReference Include="..\Entities\Entities.csproj" />
+  </ItemGroup>
+
+</Project>

Business/Concrete/CarManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Business.Abstract;
+using DataAccess.Abstract;
+using Entities.Concrete;
+
+namespace Business.Concrete
+{
+    public class CarManager : ICarService
+    {
+        private ICarDal _carDal;
+
+        public CarManager(ICarDal carDal)
+        {
+            _carDal = carDal;
+        }
+
+        public Car GetById(int id)
+        {
+            // Debug and Conditions
+
+            return _carDal.GetById(id);
+        }
+
+        public List<Car> GetAll()
+        {
+            // Debug and Conditions
+
+            return _carDal.GetAll();
+        }
+
+        public void Add(Car car)
+        {
+            // Debug and Conditions
+
+            _carDal.Add(car);
+        }
+
+        public void Update(Car car)
+        {
+            // Debug and Conditions
+
+            _carDal.Update(car);
+        }
+
+        public void Delete(Car car)
+        {
+            // Debug and Conditions
+
+            _carDal.Delete(car);
+        }
+    }
+}

ConsoleUI/ConsoleUI.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Business\Business.csproj" />
+    <ProjectReference Include="..\DataAccess\DataAccess.csproj" />
+    <ProjectReference Include="..\Entities\Entities.csproj" />
+  </ItemGroup>
+
+</Project>

ConsoleUI/Program.cs

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+using System;
+using Business.Concrete;
+using Business.Concrete.InMemory;
+using Entities.Concrete;
+
+namespace ConsoleUI
+{
+    internal class Program
+    {
+        private static void Main(string[] args)
+        {
+            CarManager carManager = new CarManager(new InMemoryCarDal());
+
+            carManager.GetAll().ForEach(p => Console.WriteLine(p.DailyPrice));
+
+            Console.WriteLine(carManager.GetById(1).DailyPrice);
+
+            Car newCar = new Car
+            { Id = 6, BrandId = 1, ColorId = 2, ModelYear = 2019, DailyPrice = 500, Description = "f" };
+
+            carManager.Add(newCar);
+            Console.WriteLine(carManager.GetById(6).DailyPrice);
+
+            newCar.DailyPrice = 300;
+            carManager.Update(newCar);
+            Console.WriteLine(carManager.GetById(6).DailyPrice);
+
+            carManager.Delete(newCar);
+        }
+    }
+}

DataAccess/Abstract/ICarDal.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Entities.Concrete;
+
+namespace DataAccess.Abstract
+{
+    public interface ICarDal
+    {
+        Car GetById(int id);
+
+        List<Car> GetAll();
+
+        void Add(Car product);
+
+        void Update(Car product);
+
+        void Delete(Car product);
+    }
+}

DataAccess/Concrete/InMemory/InMemoryCarDal.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DataAccess.Abstract;
+using Entities.Concrete;
+
+namespace Business.Concrete.InMemory
+{
+    public class InMemoryCarDal : ICarDal
+    {
+        private List<Car> _cars;
+
+        public InMemoryCarDal()
+        {
+            _cars = new List<Car>
+            {
+                new Car{Id = 1, BrandId = 1, ColorId = 1, DailyPrice = 120, ModelYear = 2010, Description = "a"},
+                new Car{Id = 2, BrandId = 1, ColorId = 4, DailyPrice = 550, ModelYear = 2012, Description = "b"},
+                new Car{Id = 3, BrandId = 2, ColorId = 5, DailyPrice = 750, ModelYear = 2015, Description = "c"},
+                new Car{Id = 4, BrandId = 2, ColorId = 2, DailyPrice = 350, ModelYear = 2005, Description = "d"},
+                new Car{Id = 5, BrandId = 3, ColorId = 1, DailyPrice = 1000, ModelYear = 2020, Description = "e"},
+            };
+        }
+
+        public Car GetById(int Id)
+        {
+            return _cars.SingleOrDefault(c => c.Id == Id);
+        }
+
+        public List<Car> GetAll()
+        {
+            return _cars;
+        }
+
+        public void Add(Car Car)
+        {
+            _cars.Add(Car);
+        }
+
+        public void Update(Car Car)
+        {
+            Car CarToUpdate = _cars.SingleOrDefault(c => c.Id == Car.Id);
+            CarToUpdate.BrandId = Car.BrandId;
+            CarToUpdate.ColorId = Car.ColorId;
+            CarToUpdate.ModelYear = Car.ModelYear;
+            CarToUpdate.DailyPrice = CarToUpdate.DailyPrice;
+            CarToUpdate.Description = CarToUpdate.Description;
+        }
+
+        public void Delete(Car Car)
+        {
+            Car CarToDelete = _cars.SingleOrDefault(c => c.Id == Car.Id);
+            _cars.Remove(CarToDelete);
+        }
+    }
+}

DataAccess/DataAccess.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Entities\Entities.csproj" />
+  </ItemGroup>
+
+</Project>

Entities/Abstract/IEntity.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Entities.Abstract
+{
+    public interface IEntity
+    {
+    }
+}

Entities/Concrete/Brand.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Entities.Abstract;
+
+namespace Entities.Concrete
+{
+    public class Brand : IEntity
+    {
+        public int Id { get; set; }
+        public string name { get; set; }
+    }
+}

Entities/Concrete/Car.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Entities.Abstract;
+
+namespace Entities.Concrete
+{
+    public class Car : IEntity
+    {
+        public int Id { get; set; }
+        public int BrandId { get; set; }
+        public int ColorId { get; set; }
+        public short ModelYear { get; set; }
+        public decimal DailyPrice { get; set; }
+        public string Description { get; set; }
+    }
+}

Entities/Concrete/Color.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Entities.Abstract;
+
+namespace Entities.Concrete
+{
+    public class Color : IEntity
+    {
+        public int Id { get; set; }
+        public string name { get; set; }
+    }
+}

Entities/Entities.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

ReCapProject.sln

@@ -0,0 +1,43 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30804.86
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Entities", "Entities\Entities.csproj", "{339C27A1-479E-4B72-AED8-AD7EF514D5FC}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataAccess", "DataAccess\DataAccess.csproj", "{A02933E3-7C1C-4651-9EAE-98E7822EB1C0}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Business", "Business\Business.csproj", "{C1321EA3-0919-4D3D-B80B-C943F791FEBB}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleUI", "ConsoleUI\ConsoleUI.csproj", "{89FC3102-DE3F-4A9C-8804-6926A4D44C47}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{339C27A1-479E-4B72-AED8-AD7EF514D5FC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{339C27A1-479E-4B72-AED8-AD7EF514D5FC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{339C27A1-479E-4B72-AED8-AD7EF514D5FC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{339C27A1-479E-4B72-AED8-AD7EF514D5FC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A02933E3-7C1C-4651-9EAE-98E7822EB1C0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A02933E3-7C1C-4651-9EAE-98E7822EB1C0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A02933E3-7C1C-4651-9EAE-98E7822EB1C0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A02933E3-7C1C-4651-9EAE-98E7822EB1C0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C1321EA3-0919-4D3D-B80B-C943F791FEBB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C1321EA3-0919-4D3D-B80B-C943F791FEBB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C1321EA3-0919-4D3D-B80B-C943F791FEBB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C1321EA3-0919-4D3D-B80B-C943F791FEBB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{89FC3102-DE3F-4A9C-8804-6926A4D44C47}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{89FC3102-DE3F-4A9C-8804-6926A4D44C47}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{89FC3102-DE3F-4A9C-8804-6926A4D44C47}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{89FC3102-DE3F-4A9C-8804-6926A4D44C47}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {2ABB2908-51FF-4969-881A-9983E947FAFD}
+	EndGlobalSection
+EndGlobal