Program.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using MyBlog.Data;
using MyBlog.Models;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddControllersWithViews();

// Helpful EF developer exception page (development only)
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

// In-Memory DB for development
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseInMemoryDatabase("MyBlogDb")); 

// Identity setup
builder.Services.AddDefaultIdentity<IdentityUser>(options => 
{
    options.SignIn.RequireConfirmedAccount = false;
    options.Password.RequireDigit = false;
    options.Password.RequiredLength = 6;
})
.AddRoles<IdentityRole>() // Optionally add role management support
.AddEntityFrameworkStores<ApplicationDbContext>();

var app = builder.Build();

// Seed initial data
using (var scope = app.Services.CreateScope())
{
    var db = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
    DataSeeder.SeedData(db);
}

using (var scope = app.Services.CreateScope())
{
    var roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();
    var userManager = scope.ServiceProvider.GetRequiredService<UserManager<IdentityUser>>();

    // Create Admin role if missing
    if (!await roleManager.RoleExistsAsync("Admin"))
        await roleManager.CreateAsync(new IdentityRole("Admin"));

    // Create default admin user
    var adminEmail = "admin@site.com";
    var admin = await userManager.FindByEmailAsync(adminEmail);

    if (admin == null)
    {
        admin = new IdentityUser { UserName = adminEmail, Email = adminEmail };
        await userManager.CreateAsync(admin, "Admin123!");
        await userManager.AddToRoleAsync(admin, "Admin");
    }
}

// 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();

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

app.MapRazorPages();
app.Run();