Program.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using GaragePRO.Data;
using Microsoft.CodeAnalysis;
using QuestPDF.Infrastructure;
using System.Globalization;
using Microsoft.AspNetCore.Localization;

var builder = WebApplication.CreateBuilder(args);
QuestPDF.Settings.License = LicenseType.Community;

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ??
                       throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlite(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>();
builder.Services.AddControllersWithViews();

builder.Services.Configure<RequestLocalizationOptions>(options =>
{

    var defaultCulture = new CultureInfo("en-US");
    var supportedCultures = new[] { defaultCulture };

    options.DefaultRequestCulture = new RequestCulture(defaultCulture);
    options.SupportedCultures = supportedCultures;
    options.SupportedUICultures = supportedCultures;
    
    options.RequestCultureProviders.Clear(); // Clear default providers
    options.RequestCultureProviders.Add(new AcceptLanguageHeaderRequestCultureProvider()); // Add back if you need language negotiation
    options.RequestCultureProviders.Add(new QueryStringRequestCultureProvider());
    options.RequestCultureProviders.Add(new CookieRequestCultureProvider());
    
});

var app = builder.Build();
app.UseRequestLocalization();
DbInitializer.Seed(app.Services);

if (app.Environment.IsDevelopment())
{
    app.UseMigrationsEndPoint();
}
else
{
    app.UseExceptionHandler("/Home/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseRouting();

app.UseAuthorization();

app.MapStaticAssets();

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

app.MapRazorPages()
    .WithStaticAssets();

app.Run();
public class CustomNumberCultureProvider : RequestCultureProvider
{
    public override Task<ProviderCultureResult?> DetermineProviderCultureResult(HttpContext httpContext)
    {

        var culture = new CultureInfo("en-US");
        var uiCulture = httpContext.Request.Headers["Accept-Language"].ToString().Split(',').FirstOrDefault();
        if (string.IsNullOrEmpty(uiCulture))
        {
            uiCulture = "en-US"; // Fallback
        }

        return Task.FromResult<ProviderCultureResult?>(
            new ProviderCultureResult(culture.Name, uiCulture)
        );
    }
}