Program.cs

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddRazorPages();
builder.Services.AddSession(options =>
{
    options.IdleTimeout= TimeSpan.FromMinutes(30);
});
builder.Services.AddMemoryCache();

var app = builder.Build();

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

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseSession();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();