Program.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();
builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseNpgsql(builder.Configuration.GetConnectionString("DbConfig")));
builder.Services.AddSession(options =>
    options.IdleTimeout = TimeSpan.FromHours(24));

builder.Services.AddHttpContextAccessor();
builder.Services.AddSession();
var app = builder.Build();


if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}
app.UseSession();
app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();