Program.cs

using Microsoft.EntityFrameworkCore;
using AgeCalculatorFrom.Data;
using AgeCalculatorFrom.Models;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddDbContext<PeopleContext>(options =>
    options.UseSqlServer(builder.Configuration.GetConnectionString("PeopleContext") ?? throw new InvalidOperationException("Connection string 'PeopleContext' not found.")));

builder.Services.AddDatabaseDeveloperPageExceptionFilter();

var app = builder.Build();

using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    SeedData.Initialize(services);
}

    // Configure the HTTP request pipeline.
    if (!app.Environment.IsDevelopment())
    {
        app.UseExceptionHandler("/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();
    }
    else
    {
        app.UseDeveloperExceptionPage();
        app.UseMigrationsEndPoint();
    }

using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;

    var context = services.GetRequiredService<PeopleContext>();
    context.Database.EnsureCreated();
}

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

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();