The Ultimate ASP.NET Core Cheat Sheet: Full-Stack Web Development Guide

Introduction: What is ASP.NET Core?

ASP.NET Core is a cross-platform, high-performance, open-source framework for building modern web applications that run on Windows, Linux, and macOS. It represents a redesign of ASP.NET that unifies the previously separate ASP.NET MVC and ASP.NET Web API into a single programming model. Built with a modular architecture, ASP.NET Core allows developers to create web applications, APIs, real-time hubs, and full-stack web solutions with superior performance, security, and scalability.

Core ASP.NET Core Concepts

Framework Architecture

• Modular Design: Components can be included via NuGet packages
• Middleware Pipeline: Request processing through configurable components
• Dependency Injection: Built-in IoC container for loose coupling
• Configuration System: Environment-based settings from multiple sources
• Hosting Model: Flexibility to self-host or run under IIS/Apache/Nginx

Application Models

• MVC (Model-View-Controller): Structured pattern for web applications
• Razor Pages: Page-based model for simpler web UI development
• Blazor: Component-based UI framework using C# instead of JavaScript
• Web API: RESTful service development
• gRPC: High-performance RPC framework
• SignalR: Real-time web functionality

ASP.NET Core Project Structure

Key Files

• Program.cs: Application entry point and configuration
• appsettings.json: Configuration settings
• Startup.cs (older versions): App configuration and service setup
• wwwroot/: Static files (CSS, JS, images)
• Controllers/: For MVC/API controllers
• Views/: For MVC views
• Pages/: For Razor Pages
• Models/: For data models
• Data/: For database context and migrations

Configuration Flow

// Program.cs in ASP.NET Core 6+
var builder = WebApplication.CreateBuilder(args);

// Service configuration
builder.Services.AddControllers();
builder.Services.AddDbContext<ApplicationDbContext>();

var app = builder.Build();

// Middleware configuration
if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
}

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();

app.MapControllers();

app.Run();

MVC Development

Controller Basics

[Route("api/[controller]")]
[ApiController]
public class ProductsController : ControllerBase
{
    private readonly ApplicationDbContext _context;
    
    public ProductsController(ApplicationDbContext context)
    {
        _context = context;
    }
    
    [HttpGet]
    public async Task<ActionResult<IEnumerable<Product>>> GetProducts()
    {
        return await _context.Products.ToListAsync();
    }
    
    [HttpGet("{id}")]
    public async Task<ActionResult<Product>> GetProduct(int id)
    {
        var product = await _context.Products.FindAsync(id);
        
        if (product == null)
        {
            return NotFound();
        }
        
        return product;
    }
    
    [HttpPost]
    public async Task<ActionResult<Product>> PostProduct(Product product)
    {
        _context.Products.Add(product);
        await _context.SaveChangesAsync();
        
        return CreatedAtAction(nameof(GetProduct), new { id = product.Id }, product);
    }
}

Razor View Basics

@model Product

<h1>@Model.Name</h1>
<p>Price: @Model.Price.ToString("C")</p>

@if (Model.IsInStock)
{
    <button>Add to Cart</button>
}
else
{
    <p>Out of stock</p>
}

Tag Helpers

<a asp-controller="Home" asp-action="Index">Home</a>
<form asp-controller="Account" asp-action="Login" method="post">
    <div>
        <label asp-for="Email"></label>
        <input asp-for="Email">
        <span asp-validation-for="Email"></span>
    </div>
    <button type="submit">Login</button>
</form>

Razor Pages

PageModel Structure

public class CreateModel : PageModel
{
    private readonly ApplicationDbContext _context;
    
    public CreateModel(ApplicationDbContext context)
    {
        _context = context;
    }
    
    [BindProperty]
    public Product Product { get; set; }
    
    public IActionResult OnGet()
    {
        return Page();
    }
    
    public async Task<IActionResult> OnPostAsync()
    {
        if (!ModelState.IsValid)
        {
            return Page();
        }
        
        _context.Products.Add(Product);
        await _context.SaveChangesAsync();
        
        return RedirectToPage("./Index");
    }
}

Razor Page Markup

@page
@model CreateModel
@{
    ViewData["Title"] = "Create Product";
}

<h1>@ViewData["Title"]</h1>

<form method="post">
    <div class="form-group">
        <label asp-for="Product.Name"></label>
        <input asp-for="Product.Name" class="form-control" />
        <span asp-validation-for="Product.Name" class="text-danger"></span>
    </div>
    
    <div class="form-group">
        <label asp-for="Product.Price"></label>
        <input asp-for="Product.Price" class="form-control" />
        <span asp-validation-for="Product.Price" class="text-danger"></span>
    </div>
    
    <button type="submit" class="btn btn-primary">Create</button>
</form>

Blazor Development

Blazor Component

@page "/counter"

<h1>Counter</h1>

<p>Current count: @currentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Increment</button>

@code {
    private int currentCount = 0;

    private void IncrementCount()
    {
        currentCount++;
    }
}

Blazor Server vs WebAssembly vs Web App

API Development

Minimal API Example

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddDbContext<TodoDb>(opt => opt.UseInMemoryDatabase("TodoList"));
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.MapGet("/todos", async (TodoDb db) =>
    await db.Todos.ToListAsync());

app.MapGet("/todos/{id}", async (int id, TodoDb db) =>
    await db.Todos.FindAsync(id) is Todo todo
        ? Results.Ok(todo)
        : Results.NotFound());

app.MapPost("/todos", async (Todo todo, TodoDb db) =>
{
    db.Todos.Add(todo);
    await db.SaveChangesAsync();
    return Results.Created($"/todos/{todo.Id}", todo);
});

app.Run();

OpenAPI/Swagger Integration

// Add to Program.cs
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { 
        Title = "My API", 
        Version = "v1",
        Description = "A simple API example"
    });
});

// In middleware pipeline
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API v1"));
}

Authentication & Authorization

JWT Authentication Setup

// Add services
builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = builder.Configuration["JWT:Issuer"],
        ValidAudience = builder.Configuration["JWT:Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(
            Encoding.UTF8.GetBytes(builder.Configuration["JWT:Secret"]))
    };
});

// Add middleware
app.UseAuthentication();
app.UseAuthorization();

Authorization Policies

// Setup policies
builder.Services.AddAuthorization(options =>
{
    options.AddPolicy("AdminOnly", policy => 
        policy.RequireRole("Administrator"));
    
    options.AddPolicy("RequireMfa", policy => 
        policy.RequireClaim("amr", "mfa"));
});

// Use in controllers/endpoints
[Authorize(Policy = "AdminOnly")]
public IActionResult AdminDashboard()
{
    return View();
}

Data Access with Entity Framework Core

DbContext Setup

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
    
    public DbSet<Product> Products { get; set; }
    public DbSet<Category> Categories { get; set; }
    
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Product>()
            .HasOne(p => p.Category)
            .WithMany(c => c.Products)
            .HasForeignKey(p => p.CategoryId);
            
        modelBuilder.Entity<Category>()
            .HasData(
                new Category { Id = 1, Name = "Electronics" },
                new Category { Id = 2, Name = "Books" }
            );
    }
}

Common EF Core Operations

// Adding entity
_context.Products.Add(new Product { Name = "Laptop", Price = 999.99m });
await _context.SaveChangesAsync();

// Querying with filtering
var expensiveProducts = await _context.Products
    .Where(p => p.Price > 500)
    .ToListAsync();

// Include related data
var productsWithCategories = await _context.Products
    .Include(p => p.Category)
    .ToListAsync();

// Update entity
var product = await _context.Products.FindAsync(1);
product.Price = 899.99m;
await _context.SaveChangesAsync();

// Delete entity
var productToDelete = await _context.Products.FindAsync(2);
_context.Products.Remove(productToDelete);
await _context.SaveChangesAsync();

Configuration and Options Pattern

Configuration Setup

// In Program.cs
var builder = WebApplication.CreateBuilder(args);

// Configuration sources are already set up in CreateBuilder
// Access configuration
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");

// Strongly-typed configuration
builder.Services.Configure<SmtpSettings>(
    builder.Configuration.GetSection("SmtpSettings"));

Using Options Pattern

// Options class
public class SmtpSettings
{
    public string Server { get; set; }
    public int Port { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
}

// In a service
public class EmailService
{
    private readonly SmtpSettings _smtpSettings;
    
    public EmailService(IOptions<SmtpSettings> smtpSettings)
    {
        _smtpSettings = smtpSettings.Value;
    }
    
    public void SendEmail(string to, string subject, string body)
    {
        // Use _smtpSettings to send email
    }
}

Dependency Injection

Service Lifetimes

// Transient: New instance created for each request
builder.Services.AddTransient<ITransientService, TransientService>();

// Scoped: New instance created for each HTTP request
builder.Services.AddScoped<IScopedService, ScopedService>();

// Singleton: Single instance for application lifetime
builder.Services.AddSingleton<ISingletonService, SingletonService>();

Service Registration Patterns

// Interface-based injection
builder.Services.AddScoped<IProductRepository, SqlProductRepository>();

// Concrete class injection
builder.Services.AddScoped<ProductService>();

// Factory-based injection
builder.Services.AddSingleton<IHttpClientFactory, HttpClientFactory>();
builder.Services.AddHttpClient("github", c =>
{
    c.BaseAddress = new Uri("https://api.github.com/");
    c.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory");
});

Middleware Components

Custom Middleware

public class RequestLoggingMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILogger<RequestLoggingMiddleware> _logger;
    
    public RequestLoggingMiddleware(RequestDelegate next, ILogger<RequestLoggingMiddleware> logger)
    {
        _next = next;
        _logger = logger;
    }
    
    public async Task InvokeAsync(HttpContext context)
    {
        _logger.LogInformation($"Request: {context.Request.Method} {context.Request.Path}");
        
        // Call the next middleware in the pipeline
        await _next(context);
        
        _logger.LogInformation($"Response: {context.Response.StatusCode}");
    }
}

// Extension method for cleaner registration
public static class RequestLoggingMiddlewareExtensions
{
    public static IApplicationBuilder UseRequestLogging(this IApplicationBuilder builder)
    {
        return builder.UseMiddleware<RequestLoggingMiddleware>();
    }
}

// In Program.cs
app.UseRequestLogging();

Built-in Middleware (in typical order)

// Exception handling
app.UseExceptionHandler("/Error");

// HTTPS redirection
app.UseHttpsRedirection();

// Static files
app.UseStaticFiles();

// Cookie policy
app.UseCookiePolicy();

// Routing
app.UseRouting();

// CORS
app.UseCors("MyCorsPolicyName");

// Authentication
app.UseAuthentication();

// Authorization
app.UseAuthorization();

// Response compression
app.UseResponseCompression();

// Response caching
app.UseResponseCaching();

// Endpoint execution
app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
    endpoints.MapRazorPages();
    endpoints.MapBlazorHub();
});

Handling Common Web Tasks

Form Validation

// Model with validation attributes
public class ProductViewModel
{
    [Required]
    [StringLength(100, MinimumLength = 3)]
    public string Name { get; set; }
    
    [Required]
    [Range(0.01, 10000)]
    [DataType(DataType.Currency)]
    public decimal Price { get; set; }
    
    [Required]
    [Display(Name = "Category")]
    public int CategoryId { get; set; }
}

// In controller
[HttpPost]
public async Task<IActionResult> Create(ProductViewModel model)
{
    if (!ModelState.IsValid)
    {
        // Return view with errors
        return View(model);
    }
    
    // Process valid form
    var product = new Product
    {
        Name = model.Name,
        Price = model.Price,
        CategoryId = model.CategoryId
    };
    
    _context.Products.Add(product);
    await _context.SaveChangesAsync();
    
    return RedirectToAction(nameof(Index));
}

File Upload Handling

// File upload in model
public class ProductUploadModel
{
    [Required]
    public string Name { get; set; }
    
    [Required]
    public IFormFile ImageFile { get; set; }
}

// In controller
[HttpPost]
public async Task<IActionResult> Upload(ProductUploadModel model)
{
    if (ModelState.IsValid)
    {
        // Process file
        var fileName = Guid.NewGuid().ToString() + Path.GetExtension(model.ImageFile.FileName);
        var filePath = Path.Combine(_environment.WebRootPath, "uploads", fileName);
        
        using (var fileStream = new FileStream(filePath, FileMode.Create))
        {
            await model.ImageFile.CopyToAsync(fileStream);
        }
        
        // Save product with image path
        var product = new Product
        {
            Name = model.Name,
            ImagePath = "/uploads/" + fileName
        };
        
        _context.Products.Add(product);
        await _context.SaveChangesAsync();
        
        return RedirectToAction(nameof(Index));
    }
    
    return View(model);
}

Error Handling

// Global exception handling in Program.cs
if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
}
else
{
    app.UseExceptionHandler("/Error");
    app.UseStatusCodePagesWithReExecute("/Error/{0}");
    app.UseHsts();
}

// Error controller
[AllowAnonymous]
public class ErrorController : Controller
{
    [Route("Error")]
    public IActionResult Error()
    {
        var exceptionHandlerPathFeature = 
            HttpContext.Features.Get<IExceptionHandlerPathFeature>();
            
        // Log the exception
        _logger.LogError(exceptionHandlerPathFeature?.Error, "Unhandled exception");
        
        return View();
    }
    
    [Route("Error/{statusCode}")]
    public IActionResult StatusCodeError(int statusCode)
    {
        var statusCodeReExecuteFeature = 
            HttpContext.Features.Get<IStatusCodeReExecuteFeature>();
            
        ViewBag.StatusCode = statusCode;
        ViewBag.OriginalPath = statusCodeReExecuteFeature?.OriginalPath;
        
        return View();
    }
}

Testing

Unit Testing Controllers

// Using xUnit, Moq, and FluentAssertions
public class ProductsControllerTests
{
    [Fact]
    public async Task GetProducts_ReturnsAllProducts()
    {
        // Arrange
        var mockRepo = new Mock<IProductRepository>();
        mockRepo.Setup(repo => repo.GetAllAsync())
            .ReturnsAsync(GetTestProducts());
            
        var controller = new ProductsController(mockRepo.Object);
        
        // Act
        var result = await controller.GetProducts();
        
        // Assert
        var actionResult = Assert.IsType<ActionResult<IEnumerable<Product>>>(result);
        var returnValue = Assert.IsType<OkObjectResult>(actionResult.Result);
        var products = Assert.IsType<List<Product>>(returnValue.Value);
        Assert.Equal(3, products.Count);
    }
    
    private List<Product> GetTestProducts()
    {
        return new List<Product>
        {
            new Product { Id = 1, Name = "Test Product 1" },
            new Product { Id = 2, Name = "Test Product 2" },
            new Product { Id = 3, Name = "Test Product 3" }
        };
    }
}

Integration Testing

// WebApplicationFactory-based testing
public class ProductsApiIntegrationTests : IClassFixture<WebApplicationFactory<Program>>
{
    private readonly WebApplicationFactory<Program> _factory;
    
    public ProductsApiIntegrationTests(WebApplicationFactory<Program> factory)
    {
        _factory = factory.WithWebHostBuilder(builder =>
        {
            builder.ConfigureServices(services =>
            {
                // Remove the app's ApplicationDbContext registration
                var descriptor = services.SingleOrDefault(
                    d => d.ServiceType == typeof(DbContextOptions<ApplicationDbContext>));
                
                if (descriptor != null)
                {
                    services.Remove(descriptor);
                }
                
                // Add ApplicationDbContext using an in-memory database
                services.AddDbContext<ApplicationDbContext>(options =>
                {
                    options.UseInMemoryDatabase("InMemoryDbForTesting");
                });
                
                // Seed test data
                var sp = services.BuildServiceProvider();
                using (var scope = sp.CreateScope())
                {
                    var scopedServices = scope.ServiceProvider;
                    var db = scopedServices.GetRequiredService<ApplicationDbContext>();
                    
                    db.Database.EnsureCreated();
                    
                    // Seed the database
                    if (!db.Products.Any())
                    {
                        db.Products.AddRange(
                            new Product { Id = 1, Name = "Test Product 1", Price = 9.99m },
                            new Product { Id = 2, Name = "Test Product 2", Price = 19.99m }
                        );
                        db.SaveChanges();
                    }
                }
            });
        });
    }
    
    [Fact]
    public async Task GetProducts_ReturnsSuccessAndProducts()
    {
        // Arrange
        var client = _factory.CreateClient();
        
        // Act
        var response = await client.GetAsync("/api/products");
        
        // Assert
        response.EnsureSuccessStatusCode();
        var content = await response.Content.ReadAsStringAsync();
        var products = JsonSerializer.Deserialize<List<Product>>(content, 
            new JsonSerializerOptions { PropertyNameCaseInsensitive = true });
            
        Assert.Equal(2, products.Count);
        Assert.Contains(products, p => p.Name == "Test Product 1");
        Assert.Contains(products, p => p.Name == "Test Product 2");
    }
}

Performance Optimization

Response Caching

// Add service
builder.Services.AddResponseCaching();

// Configure middleware
app.UseResponseCaching();

// Use in controller/endpoint
[HttpGet]
[ResponseCache(Duration = 60, Location = ResponseCacheLocation.Any)]
public async Task<ActionResult<IEnumerable<Product>>> GetProducts()
{
    return await _context.Products.ToListAsync();
}

Output Caching (Newer API)

// Add service
builder.Services.AddOutputCache(options =>
{
    // Configure default policy
    options.AddBasePolicy(builder => builder.Expire(TimeSpan.FromMinutes(5)));
    
    // Add named policies
    options.AddPolicy("ShortLived", builder => 
        builder.Expire(TimeSpan.FromSeconds(10))
               .SetVaryByQuery("page", "pageSize"));
});

// Use middleware
app.UseOutputCache();

// Use in controller/endpoint
[HttpGet]
[OutputCache(PolicyName = "ShortLived")]
public async Task<ActionResult<IEnumerable<Product>>> GetProducts(
    [FromQuery] int page = 1, 
    [FromQuery] int pageSize = 10)
{
    // Implementation
}

Memory Caching

// Add service
builder.Services.AddMemoryCache();

// Use in service
public class CachedProductService
{
    private readonly IMemoryCache _cache;
    private readonly ApplicationDbContext _context;
    
    public CachedProductService(IMemoryCache cache, ApplicationDbContext context)
    {
        _cache = cache;
        _context = context;
    }
    
    public async Task<List<Product>> GetProductsAsync()
    {
        // Check if data exists in cache
        if (!_cache.TryGetValue("AllProducts", out List<Product> products))
        {
            // If not in cache, get from database
            products = await _context.Products.ToListAsync();
            
            // Save to cache with expiration
            var cacheOptions = new MemoryCacheEntryOptions()
                .SetAbsoluteExpiration(TimeSpan.FromMinutes(10))
                .SetSlidingExpiration(TimeSpan.FromMinutes(2));
                
            _cache.Set("AllProducts", products, cacheOptions);
        }
        
        return products;
    }
}

Common Challenges and Solutions

Cross-Origin Resource Sharing (CORS)

// Add service with policy
builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowSpecificOrigin", builder =>
    {
        builder.WithOrigins("https://example.com")
               .AllowAnyMethod()
               .AllowAnyHeader()
               .AllowCredentials();
    });
    
    options.AddPolicy("AllowAnyOrigin", builder =>
    {
        builder.AllowAnyOrigin()
               .AllowAnyMethod()
               .AllowAnyHeader();
    });
});

// Use middleware
app.UseCors("AllowSpecificOrigin");

// Or apply to specific controllers/endpoints
[EnableCors("AllowAnyOrigin")]
[Route("api/[controller]")]
public class PublicApiController : ControllerBase
{
    // Implementation
}

Handling Long-Running Operations

// Add background service
public class ProcessingService : BackgroundService
{
    private readonly ILogger<ProcessingService> _logger;
    
    public ProcessingService(ILogger<ProcessingService> logger)
    {
        _logger = logger;
    }
    
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogInformation("Processing Service is starting.");
        
        while (!stoppingToken.IsCancellationRequested)
        {
            _logger.LogInformation("Processing items...");
            
            // Process work items
            
            await Task.Delay(TimeSpan.FromMinutes(5), stoppingToken);
        }
        
        _logger.LogInformation("Processing Service is stopping.");
    }
}

// Register service
builder.Services.AddHostedService<ProcessingService>();

Localization and Globalization

// Add services
builder.Services.AddLocalization(options => options.ResourcesPath = "Resources");

builder.Services.AddMvc()
    .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
    .AddDataAnnotationsLocalization();
    
builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    var supportedCultures = new[]
    {
        new CultureInfo("en-US"),
        new CultureInfo("fr"),
        new CultureInfo("es")
    };
    
    options.DefaultRequestCulture = new RequestCulture("en-US");
    options.SupportedCultures = supportedCultures;
    options.SupportedUICultures = supportedCultures;
});

// Use middleware
app.UseRequestLocalization();

// In controller
public class HomeController : Controller
{
    private readonly IStringLocalizer<HomeController> _localizer;
    
    public HomeController(IStringLocalizer<HomeController> localizer)
    {
        _localizer = localizer;
    }
    
    public IActionResult Index()
    {
        ViewData["Welcome"] = _localizer["WelcomeMessage"];
        return View();
    }
}

Best Practices

Security Best Practices

1. Use HTTPS: Enable HTTPS in development and production
2. Input Validation: Validate all user inputs with model validation
3. Output Encoding: Use built-in features like @Html.Raw sparingly
4. Anti-forgery Tokens: Use @Html.AntiForgeryToken() for forms
5. Authorization Policies: Implement granular authorization with policies
6. Secure Configuration: Store secrets in User Secrets or Key Vault
7. Data Protection API: Use for cookie protection and encryption
8. Regular Updates: Keep dependencies and frameworks updated

Performance Best Practices

1. Asynchronous Programming: Use async/await for I/O-bound operations
2. Caching Strategy: Implement appropriate caching for frequently accessed data
3. Bundling & Minification: Optimize static assets for production
4. Efficient Queries: Use specific queries and avoid N+1 query problems
5. Lazy Loading: Configure Entity Framework appropriately
6. Response Compression: Enable for appropriate content types
7. Health Checks: Implement to monitor application health
8. Use Minimal APIs: For simple CRUD operations when appropriate

Deployment Best Practices

1. Environment Configuration: Use environment-specific settings
2. Containerization: Use Docker for consistent deployments
3. CI/CD Pipeline: Automate build, test, and deployment processes
4. Logging & Monitoring: Implement comprehensive logging and monitoring
5. Database Migrations: Use EF Core migrations for database updates
6. Load Balancing: Deploy behind load balancer for high availability
7. Backup Strategy: Implement regular database backups
8. Rollback Plan: Have a strategy for rolling back problematic deployments

Resources for Further Learning

Official Documentation

• ASP.NET Core Documentation
• .NET API Browser
• Entity Framework Core Documentation
• Blazor Documentation

Community Resources

• ASP.NET Core GitHub Repository
• .NET Foundation
• Stack Overflow – ASP.NET Core
• .NET Community Standup

Recommended Books

• “ASP.NET Core in Action” by Andrew Lock
• “Pro ASP.NET Core 6” by Adam Freeman
• “Microservices with ASP.NET Core” by Christian Horsdal
• “Entity Framework Core in Action” by Jon P. Smith

This cheat sheet provides a comprehensive reference for ASP.NET Core development. For the most current features and practices, always refer to the official documentation as the framework continues to evolve.