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App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Blagodat.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+namespace Blagodat;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new Registration();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

Blagodat.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.2.1" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.2.1" />
+    <PackageReference Include="Avalonia.ReactiveUI" Version="0.8.1" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.2.1" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.2.1" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.2.1">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.10">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.10" />
+  </ItemGroup>
+</Project>

Blagodat.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35514.174 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Blagodat", "Blagodat.csproj", "{FECC1AE0-6656-4657-8763-B25A62C978C3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FECC1AE0-6656-4657-8763-B25A62C978C3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FECC1AE0-6656-4657-8763-B25A62C978C3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FECC1AE0-6656-4657-8763-B25A62C978C3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FECC1AE0-6656-4657-8763-B25A62C978C3}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Blagodat.MainWindow"
+		 Title="Function Window" Height="250" Width="300">
+	<DockPanel>
+		
+	</DockPanel>
+</Window>

MainWindow.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using ReactiveUI;
+
+namespace Blagodat;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+        new Registration().Show();
+    }
+}

Models/Client.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Blagodat.Models;
+
+public partial class Client
+{
+    public int ClientId { get; set; }
+
+    public string? Fio { get; set; }
+
+    public int? CodeClient { get; set; }
+
+    public string PassportData { get; set; } = null!;
+
+    public DateOnly? DateOfBirth { get; set; }
+
+    public string? Address { get; set; }
+
+    public string? EMail { get; set; }
+
+    public string? Password { get; set; }
+}

Models/Order.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Blagodat.Models;
+
+public partial class Order
+{
+    public int IdOrder { get; set; }
+
+    public int ClientCode { get; set; }
+
+    public DateOnly DateOfCreation { get; set; }
+
+    public TimeOnly OrderTime { get; set; }
+
+    public string Status { get; set; } = null!;
+
+    public DateOnly? ClosingDate { get; set; }
+
+    public int RentalTimeMin { get; set; }
+
+    public virtual ICollection<OrdersAndService> OrdersAndServices { get; set; } = new List<OrdersAndService>();
+}

Models/OrdersAndService.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Blagodat.Models;
+
+public partial class OrdersAndService
+{
+    public int IdOrdersAndServices { get; set; }
+
+    public int? Order { get; set; }
+
+    public int? Service { get; set; }
+
+    public virtual Order? OrderNavigation { get; set; }
+
+    public virtual Service? ServiceNavigation { get; set; }
+}

Models/Service.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Blagodat.Models;
+
+public partial class Service
+{
+    public int IdServices { get; set; }
+
+    public string? NameServices { get; set; }
+
+    public string? CodeServices { get; set; }
+
+    public decimal? CostPerHour { get; set; }
+
+    public virtual ICollection<OrdersAndService> OrdersAndServices { get; set; } = new List<OrdersAndService>();
+}

Models/Staff.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Blagodat.Models;
+
+public partial class Staff
+{
+    public string IdStaff { get; set; } = null!;
+
+    public string? Post { get; set; }
+
+    public string? Fio { get; set; }
+
+    public string? Login { get; set; }
+
+    public string? Password { get; set; }
+
+    public DateOnly? LastLoginDate { get; set; }
+
+    public TimeOnly? LastLoginTime { get; set; }
+
+    public bool? TypeOfEntrance { get; set; }
+}

Models/User7Context.cs

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+using System;
+using System.Collections.Generic;
+using Microsoft.EntityFrameworkCore;
+
+namespace Blagodat.Models;
+
+public partial class User7Context : DbContext
+{
+    public User7Context()
+    {
+    }
+
+    public User7Context(DbContextOptions<User7Context> options)
+        : base(options)
+    {
+    }
+
+    public virtual DbSet<Client> Clients { get; set; }
+
+    public virtual DbSet<Order> Orders { get; set; }
+
+    public virtual DbSet<OrdersAndService> OrdersAndServices { get; set; }
+
+    public virtual DbSet<Service> Services { get; set; }
+
+    public virtual DbSet<Staff> Staff { get; set; }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+#warning To protect potentially sensitive information in your connection string, you should move it out of source code. You can avoid scaffolding the connection string by using the Name= syntax to read it from configuration - see https://go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see https://go.microsoft.com/fwlink/?LinkId=723263.
+        => optionsBuilder.UseNpgsql("Host=45.67.56.214;Port=5421;Database=user7;Username=user7;Password=a8yLONBC");
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Client>(entity =>
+        {
+            entity.HasKey(e => e.ClientId).HasName("clients_pk");
+
+            entity.ToTable("clients", "blagodat");
+
+            entity.Property(e => e.ClientId)
+                .UseIdentityAlwaysColumn()
+                .HasColumnName("client_id");
+            entity.Property(e => e.Address)
+                .HasColumnType("character varying")
+                .HasColumnName("address");
+            entity.Property(e => e.CodeClient).HasColumnName("code_client");
+            entity.Property(e => e.DateOfBirth).HasColumnName("date_of_birth");
+            entity.Property(e => e.EMail)
+                .HasColumnType("character varying")
+                .HasColumnName("e-mail");
+            entity.Property(e => e.Fio)
+                .HasColumnType("character varying")
+                .HasColumnName("fio");
+            entity.Property(e => e.PassportData)
+                .HasColumnType("character varying")
+                .HasColumnName("passport_data");
+            entity.Property(e => e.Password)
+                .HasColumnType("character varying")
+                .HasColumnName("password");
+        });
+
+        modelBuilder.Entity<Order>(entity =>
+        {
+            entity.HasKey(e => e.IdOrder).HasName("orders_pkey");
+
+            entity.ToTable("orders", "blagodat");
+
+            entity.Property(e => e.IdOrder)
+                .UseIdentityAlwaysColumn()
+                .HasColumnName("id_order");
+            entity.Property(e => e.ClientCode).HasColumnName("client_code");
+            entity.Property(e => e.ClosingDate).HasColumnName("closing_date");
+            entity.Property(e => e.DateOfCreation).HasColumnName("date_of_creation");
+            entity.Property(e => e.OrderTime).HasColumnName("order_time");
+            entity.Property(e => e.RentalTimeMin).HasColumnName("rental_time_min");
+            entity.Property(e => e.Status)
+                .HasColumnType("character varying")
+                .HasColumnName("status");
+        });
+
+        modelBuilder.Entity<OrdersAndService>(entity =>
+        {
+            entity.HasKey(e => e.IdOrdersAndServices).HasName("orders_and_services_pk");
+
+            entity.ToTable("orders_and_services", "blagodat");
+
+            entity.Property(e => e.IdOrdersAndServices)
+                .UseIdentityAlwaysColumn()
+                .HasColumnName("id_orders_and_services");
+            entity.Property(e => e.Order).HasColumnName("order");
+            entity.Property(e => e.Service).HasColumnName("service");
+
+            entity.HasOne(d => d.OrderNavigation).WithMany(p => p.OrdersAndServices)
+                .HasForeignKey(d => d.Order)
+                .HasConstraintName("orders_and_services_orders_fk");
+
+            entity.HasOne(d => d.ServiceNavigation).WithMany(p => p.OrdersAndServices)
+                .HasForeignKey(d => d.Service)
+                .HasConstraintName("orders_and_services_services_fk");
+        });
+
+        modelBuilder.Entity<Service>(entity =>
+        {
+            entity.HasKey(e => e.IdServices).HasName("services_pk");
+
+            entity.ToTable("services", "blagodat");
+
+            entity.Property(e => e.IdServices)
+                .ValueGeneratedNever()
+                .HasColumnName("id_services");
+            entity.Property(e => e.CodeServices)
+                .HasColumnType("character varying")
+                .HasColumnName("code_services");
+            entity.Property(e => e.CostPerHour).HasColumnName("cost_per_hour");
+            entity.Property(e => e.NameServices)
+                .HasColumnType("character varying")
+                .HasColumnName("name_services");
+        });
+
+        modelBuilder.Entity<Staff>(entity =>
+        {
+            entity.HasKey(e => e.IdStaff).HasName("staff_pk");
+
+            entity.ToTable("staff", "blagodat");
+
+            entity.Property(e => e.IdStaff)
+                .HasColumnType("character varying")
+                .HasColumnName("id_staff");
+            entity.Property(e => e.Fio)
+                .HasColumnType("character varying")
+                .HasColumnName("fio");
+            entity.Property(e => e.LastLoginDate).HasColumnName("last_login_date");
+            entity.Property(e => e.LastLoginTime).HasColumnName("last_login_time");
+            entity.Property(e => e.Login)
+                .HasColumnType("character varying")
+                .HasColumnName("login");
+            entity.Property(e => e.Password).HasColumnType("character varying");
+            entity.Property(e => e.Post)
+                .HasColumnType("character varying")
+                .HasColumnName("post");
+            entity.Property(e => e.TypeOfEntrance).HasColumnName("type_of_entrance");
+        });
+
+        OnModelCreatingPartial(modelBuilder);
+    }
+
+    partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
+}

Program.cs

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+using Avalonia;
+using System;
+
+namespace Blagodat;
+
+class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}

Registration.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Blagodat.Registration"
+        Title="Registration">
+	<StackPanel Spacing="15" HorizontalAlignment="Center" VerticalAlignment="Center">
+		<TextBlock Text="Введите логин"/>
+		<TextBox Width="300" x:Name="LoginTextBox" ></TextBox>
+		<TextBlock Text="Введите пароль"/>
+		<TextBox Width="300" x:Name="PasswordTextBox" ></TextBox>
+		<StackPanel Spacing="5" Orientation="Horizontal">
+			<Button x:Name="RegisterClick" Click="RegisterClick_OnClick" Content="Зарегистрироваться"/>
+			<Button x:Name="LoginClick" Click="LoginClick_OnClick" Content="Войти"/>
+		</StackPanel>
+	</StackPanel>
+</Window>

Registration.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Blagodat.Models;
+
+namespace Blagodat;
+
+public partial class Registration : Window
+{
+    public Registration()
+    {
+        InitializeComponent();
+    }
+    private void RegisterClick_OnClick(object? sender, RoutedEventArgs e)
+    {
+        if (string.IsNullOrEmpty(LoginTextBox.Text)) return;
+        if (string.IsNullOrEmpty(PasswordTextBox.Text)) return;
+        using var dbContext = new User7Context();
+        var user = new Client
+        {
+            Fio = LoginTextBox.Text,
+            Password = PasswordTextBox.Text
+        };
+        dbContext.Clients.Add(user);
+        if (dbContext.SaveChanges() > 0)
+        {
+            new MainWindow().Show();
+            Close();
+        }
+    }
+
+    private void LoginClick_OnClick(object? sender, RoutedEventArgs e)
+    {
+        new MainWindow().Show();
+        Close();
+    }
+}

app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="Blagodat.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

bin/Debug/net9.0/Blagodat.runtimeconfig.json

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+{
+  "runtimeOptions": {
+    "tfm": "net9.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "9.0.0"
+    },
+    "configProperties": {
+      "System.Reflection.NullabilityInfoContext.IsSupported": true,
+      "System.Runtime.InteropServices.BuiltInComInterop.IsSupported": true,
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}