Add project files.

Model/Player.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serialization_Demo.Model
+{
+    public class Player
+    {
+
+        public string Name { get; set; }
+        public int Score { get; set; }
+
+    }
+}

Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using Serialization_Demo.Model;
+using System.Runtime.CompilerServices;
+using System.Text.Json;
+
+namespace Serialization_Demo
+{
+    class Program
+    {
+        private static List<Player> players = new List<Player>();
+        private static string filePath = "players.json";
+        static async Task Main(string[] args) // <-- HIER async Task Main
+        {
+            if (File.Exists(filePath))
+            {
+                players = await DeserializePlayersAsync(filePath); // <-- await
+                Console.WriteLine("Players loaded from file:");
+                foreach (var player in players)
+                {
+                    Console.WriteLine($"Name: {player.Name}, Score: {player.Score}");
+                }
+            }
+            else
+            {
+                players = new List<Player>
+                {
+                    new Player { Name = "Player 1", Score = 100 },
+                    new Player { Name = "Player 2", Score = 200 },
+                    new Player { Name = "Player 3", Score = 300 }
+                };
+
+                await SerializePlayersAsync(players, filePath); // <-- await
+                Console.WriteLine($"Players ({players.Count}) written to file");
+            }
+        }
+
+
+        private static async Task SerializePlayersAsync(List<Player> players, string filePath)
+        {
+            string json = JsonSerializer.Serialize(players);
+            await File.WriteAllTextAsync(filePath, json); // <-- async versie
+        }
+
+        private static async Task<List<Player>> DeserializePlayersAsync(string filePath)
+        {
+            string json = await File.ReadAllTextAsync(filePath); // <-- async versie
+            List<Player> players = JsonSerializer.Deserialize<List<Player>>(json);
+            return players ?? new List<Player>(); // kleine extra check
+        }
+    }
+}

Serialization_Demo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Serialization_Demo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35919.96 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Serialization_Demo", "Serialization_Demo.csproj", "{78E0108A-B3F3-4CD3-BCA7-4B5289859AB9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{78E0108A-B3F3-4CD3-BCA7-4B5289859AB9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{78E0108A-B3F3-4CD3-BCA7-4B5289859AB9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{78E0108A-B3F3-4CD3-BCA7-4B5289859AB9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{78E0108A-B3F3-4CD3-BCA7-4B5289859AB9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4DB8CC8B-4B64-4EBE-B876-2291FE7F5E07}
+	EndGlobalSection
+EndGlobal