Finished Writing a Report with LINQ

Introduction/Introduction.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30907.101
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Introduction", "Introduction\Introduction.csproj", "{53450129-90CC-4C40-BDB3-295F60669012}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{53450129-90CC-4C40-BDB3-295F60669012}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{53450129-90CC-4C40-BDB3-295F60669012}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{53450129-90CC-4C40-BDB3-295F60669012}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{53450129-90CC-4C40-BDB3-295F60669012}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {3A6B85BA-05FF-44DA-B35D-12FDDCF35AC7}
+	EndGlobalSection
+EndGlobal

Introduction/Introduction/Introduction.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Introduction/Introduction/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace Introduction
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string path = Directory.GetCurrentDirectory();
+            ShowLargeFilesWithoutLinq(path);
+
+            Console.WriteLine("***");
+            ShowLargeFilesWithLinq(path);
+        }
+
+        private static void ShowLargeFilesWithLinq(string path)
+        {
+            var query = new DirectoryInfo(path).GetFiles()
+                        .OrderBy(f => f.Length)
+                        .Take(5);
+            foreach (var file in query.Take(5))
+            {
+                Console.WriteLine($"{file.Name,-50} : {file.Length,10:N0}");
+            }
+        }
+
+        private static void ShowLargeFilesWithoutLinq(string path)
+        {
+            DirectoryInfo directory = new DirectoryInfo(path);
+            FileInfo[] files = directory.GetFiles();
+            Array.Sort(files, new FileInfoComparer());
+
+            for (int i = 0; i < 5; i++)
+            {
+                FileInfo file = files[i];
+                Console.WriteLine($"{file.Name, -20} : {file.Length, 10:N0}");
+            }
+        }
+        
+    }
+
+    public class FileInfoComparer : IComparer<FileInfo>
+    {
+        public int Compare(FileInfo x, FileInfo y)
+        {
+            return y.Length.CompareTo(x.Length);
+        }
+    }
+}