Added my project

Flashcards.Ledana/Controllers/FlashCardController.cs

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+using Flashcards.Ledana.DTOs;
+using Flashcards.Ledana.Models;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Flashcards.Ledana.Controllers
+{
+    internal class FlashCardController
+    {
+        internal static void AddFlashCard(FlashCard card)
+        {
+            using var db = new FlashcardsContext();
+            db.Flashcards.Add(card);
+            db.SaveChanges();
+        }
+
+        internal static void DeleteCard(FlashCard card)
+        {
+            using var db = new FlashcardsContext();
+            db.Flashcards.Remove(card);
+            db.SaveChanges();
+        }
+
+        internal static List<FlashCardDTO> GetFlashCardDTOs(int id)
+        {
+            try
+            {
+                using var db = new FlashcardsContext();
+                var cards = db.Flashcards
+                    .AsEnumerable()
+                    .Where(f => f.StackId == id)
+                    .Select((f, index) => new FlashCardDTO
+                    {
+                        Id = index + 1,
+                        Front = f.Front
+                    })
+                    .ToList();
+                return cards;
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine("Query didn't work. " + e.Message);
+                return [];
+            }
+        }
+
+        internal static int GetFlashCardNumberPerStack(int id)
+        {
+            using var db = new FlashcardsContext();
+            return db.Flashcards
+                .Where(f => f.StackId == id)
+                .Count();
+        }
+
+        internal static List<FlashCard> GetFlashCards(int id)
+        {
+            using var db = new FlashcardsContext();
+            return db.Flashcards
+                .Where(f => f.StackId == id)
+                .ToList();
+        }
+    }
+}

Flashcards.Ledana/Controllers/StackController.cs

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+using Flashcards.Ledana.Models;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Flashcards.Ledana.Controllers
+{
+    internal static class StackController
+    {
+        internal static void AddStack(Stack stack)
+        {
+            using var db = new FlashcardsContext();
+            db.Stacks.Add(stack);
+            db.SaveChanges();
+        }
+
+        internal static void DeleteStack(Stack stack)
+        {
+            using var db = new FlashcardsContext();
+            db.Stacks.Remove(stack);
+            db.SaveChanges();
+        }
+
+        internal static List<Stack> GetAllStacks()
+        {
+            using var db = new FlashcardsContext();
+            return db.Stacks
+                .Include(s => s.Flashcards)
+                .ToList();
+        }
+    }
+}

Flashcards.Ledana/Controllers/StudySessionController.cs

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+using Flashcards.Ledana.DTOs;
+using Flashcards.Ledana.Models;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Flashcards.Ledana.Controllers
+{
+    internal class StudySessionController
+    {
+        internal static void AddStudySession(StudySession studySession)
+        {
+            try
+            {
+                using var db = new FlashcardsContext();
+                db.StudySessions.Add(studySession);
+                db.SaveChanges();
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine("Query didn't work to add study session " + e.Message);
+            }
+        }
+
+        internal static List<StudySessionDTO> GetSessions()
+        {
+            try
+            {
+                using var db = new FlashcardsContext();
+                var sessions = db.StudySessions
+                    .Select(s => new StudySessionDTO
+                    {
+                        StackName = s.FlashCard.Stack.Name,
+                        FrontCard = s.FlashCard.Front,
+                        BackCard = s.FlashCard.Back,
+                        Answer = s.Answer,
+                        Score = s.Score
+                    })
+                    .ToList();
+                return sessions;
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine("Query didn't work. " + e.Message);
+                return [];
+            }
+        }
+
+        internal static bool ValidateAnswer(int id, string answer)
+        {
+            using var db = new FlashcardsContext();
+            var result = db.Flashcards
+                .Any(f => f.Id == id && f.Back == answer);
+            return result;
+        }
+    }
+}

Flashcards.Ledana/DTOs/FlashCardDTO.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Flashcards.Ledana.DTOs
+{
+    internal class FlashCardDTO
+    {
+        public int Id { get; set; }
+        public string Front { get; set; } = null!;
+    }
+}

Flashcards.Ledana/DTOs/StudySessionDTO.cs

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+namespace Flashcards.Ledana.DTOs;
+    internal class StudySessionDTO
+    {
+        public string StackName { get; set; } = null!;
+    public DateTime DateTime { get; set; }
+        public string FrontCard { get; set; } = null!;
+        public string BackCard { get; set; } = null!;
+        public string Answer { get; set; } = null!;
+        public string Score { get; set; } = null!;
+    }

Flashcards.Ledana/Enums.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Flashcards.Ledana
+{
+    internal class Enums
+    {
+        internal enum MainMenuOptions
+        {
+            ManageStacks,
+            ManageFlashCards,
+            Study,
+            ViewStudySession,
+            Quit
+        }
+        internal enum ManageStacksOptions
+        {
+            AddStack,
+            DeleteStack,
+            ViewStack,
+            ViewAllStacks,
+            GoBack
+        }
+        internal enum ManageFlashCardsOptions
+        {
+            AddFlashCard,
+            DeleteFlashCard,
+            GoBack
+        }
+    }
+}

Flashcards.Ledana/Flashcards.Ledana.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.7" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.7">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.7" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.7">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Spectre.Console" Version="0.55.2" />
+  </ItemGroup>
+
+</Project>

Flashcards.Ledana/Flashcards.Ledana.slnx

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+<Solution>
+  <Project Path="Flashcards.Ledana.csproj" />
+</Solution>

Flashcards.Ledana/FlashcardsContext.cs

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+using Flashcards.Ledana.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Flashcards.Ledana;
+
+internal class FlashcardsContext : DbContext
+{
+    public DbSet<FlashCard> Flashcards { get; set; }
+    public DbSet<Stack> Stacks { get; set; }
+    public DbSet<StudySession> StudySessions { get; set; }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        optionsBuilder.UseSqlServer("Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=FlashCardDb;");
+    }
+}