Second task

.gitignore

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+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/

ConsoleApp2.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp2", "ConsoleApp2\ConsoleApp2.csproj", "{87E797D6-27CD-427F-89E0-21FBC4702711}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{87E797D6-27CD-427F-89E0-21FBC4702711}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{87E797D6-27CD-427F-89E0-21FBC4702711}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{87E797D6-27CD-427F-89E0-21FBC4702711}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{87E797D6-27CD-427F-89E0-21FBC4702711}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

ConsoleApp2/ConsoleApp2.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="ConsoleMenu-simple" Version="2.4.3" />
+    </ItemGroup>
+
+</Project>

ConsoleApp2/ICollectionItem.cs

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+namespace ConsoleApp2;
+
+public interface ICollectionItem
+{
+    int _id
+        {
+            get;
+            set;
+        }
+        void validateWholeClass();
+    }

ConsoleApp2/Menu.cs

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+namespace ConsoleApp2;
+
+using System.Collections.Generic;
+using System;
+using System.Linq;
+using System.Threading;
+using ConsoleTools;
+
+public class Menu
+{
+    private REGISTRATION_CERTIFICATE_COLLECTION<REGISTRATION_CERTIFICATE> _collection;
+    public Menu()
+    {
+        _collection = new REGISTRATION_CERTIFICATE_COLLECTION<REGISTRATION_CERTIFICATE>();
+
+        _collection.deserealizeFromFile();
+        var dictionary = new Dictionary<int, Delegate>()
+        {
+            { 1, Add},
+            { 2, Remove},
+            { 3, Find},
+            { 4, Sort},
+            { 5, Edit},
+        };
+
+        const string text = "1 - add\n" +
+                            "2 - remove\n" +
+                            "3 - search\n" +
+                            "4 - sort\n" +
+                            "5 - edit\n" +
+                            "0 - exit";
+
+        foreach (var operation in InterfaceGetOperation(text, 0)) {
+            try
+            {
+                dictionary[operation].DynamicInvoke();
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine("Incorect index\n" +
+                                  "try again");
+            }
+
+        }
+
+    }
+
+    static public IEnumerable<int> InterfaceGetOperation(string text, int exitKey) {
+        while (true)
+        {
+            Console.WriteLine(text);
+            int operation = Convert.ToInt32(Console.ReadLine());
+
+            if (operation == exitKey)
+            {
+                break;
+            }
+            yield return operation;
+        }
+    }
+
+    private void Sort()
+    {
+        Console.WriteLine("Please enter field by which you want sort: ");
+        var value = Console.ReadLine();
+
+        try
+        {
+            _collection.sort(value);
+            Console.Write(_collection);
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine("There isn't such fields");
+        }
+    }
+
+    private void Find()
+    {
+        Console.WriteLine("Please enter value for search: ");
+        var value = Console.ReadLine();
+        var seachedByValue = _collection.searchByValue(value);
+        seachedByValue.ForEach(item => Console.WriteLine(item));
+        if(seachedByValue.Count==0)
+            Console.WriteLine("There is no such elements");
+    }
+
+    private void Add()
+    {
+        var certificate = REGISTRATION_CERTIFICATE.readFromConsole();
+        try
+        {
+            _collection.Add(certificate);
+            Console.Write(_collection);
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine(e.Message);
+        }
+
+
+    }
+
+    private void Remove()
+    {
+        Console.WriteLine("Please enter id:");
+        try
+        {
+            var index = Convert.ToInt32(Console.ReadLine());
+            _collection.Remove(index);
+            Console.Write(_collection);
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine("Invalid index \n" +
+                              "Try again");
+        }
+
+    }
+
+    private void Edit()
+    {
+        Console.WriteLine("Please enter id of certificate which you want to edit:");
+        try
+        {
+            var index = Convert.ToInt32(Console.ReadLine());
+            _collection.Edit(index);
+            Console.Write(_collection);
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine("Invalid values");
+        }
+
+    }
+}

ConsoleApp2/Program.cs

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+
+namespace ConsoleApp2
+{
+    public class Registration
+    {
+
+        // This is the main entry point for the application.
+        public static void Main(string[] args)
+        {
+            var menu = new Menu();
+        }
+    }
+}