Program.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Mystore.Data;
using Mystore.Models;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(connectionString));
builder.Services.AddIdentity<User, IdentityRole>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();
builder.Services.AddControllersWithViews();
builder.Services.AddRazorPages();

var app = builder.Build();

// Create roles and admin user
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>();
    var userManager = services.GetRequiredService<UserManager<User>>();
    await CreateRolesAndAdminUser(roleManager, userManager);
}

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}

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

app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();

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

app.Run();

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


static async Task SeedData(ApplicationDbContext context)
{
    if (!context.Categories.Any())
    {
        var categories = new List<Category>
            {
                new Category { Name = "Electronics" },
                new Category { Name = "Books" },
                new Category { Name = "Clothing" }
            };
        context.Categories.AddRange(categories);
        await context.SaveChangesAsync();
    }
}

async Task CreateRolesAndAdminUser(RoleManager<IdentityRole> roleManager, UserManager<User> userManager)
{
    string[] roleNames = { "Admin", "Customer" };
    IdentityResult roleResult;

    foreach (var roleName in roleNames)
    {
        var roleExist = await roleManager.RoleExistsAsync(roleName);
        if (!roleExist)
        {
            roleResult = await roleManager.CreateAsync(new IdentityRole(roleName));
        }
    }

    var powerUser = new User
    {
        UserName = "admin@admin.com",
        Email = "admin@admin.com",
        FirstName = "Super",
        LastName = "Admin"
    };

    string userPassword = "Admin@123";
    var user = await userManager.FindByEmailAsync("admin@admin.com");

    if (user == null)
    {
        var createPowerUser = await userManager.CreateAsync(powerUser, userPassword);
        if (createPowerUser.Succeeded)
        {
            await userManager.AddToRoleAsync(powerUser, "Admin");
        }
    }
}