Standard CRUD in .NET

Just a record:

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using ReallyTrue.Models; using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Web.Http;   namespace ReallyTrue {     public class CustomersController : ApiController     {         private ApplicationDbContext _context;           public CustomersController()         {             _context = new ApplicationDbContext();         }           public IEnumerable<Customer> GetCustomers()         {             var customer = _context.Customers.SingleOrDefault(c => c.Id = id);         }           public Customer GetCustomer(int id)         {             var customer = _context.Customers.SingleOrDefault(c => c.Id == id);             if (customer == null)                 throw new HttpResponseException(HttpStatusCode.NotFound);             return customer;         }           [HttpPost]         public Customer CreateCustomer(Customer customer)         {             if (!ModelState.IsValid)             {                 throw new HttpResponseException(HttpStatusCode.BadRequest);             }               _context.Customers.Add(customer);             _context.SaveChanges();               return customer;         }           [HttpPut]         public void UpdateCustomer(int id, Customer customer)         {             if (!ModelState.IsValid)             {                 throw new HttpResponseException(HttpStatusCode.BadRequest);             }               var customerInDb = _context.Customers.SingleOrDefault(c => c.Id == id);               if (customerInDb == null)                 throw new HttpResponseException(HttpStatusCode.NotFound);                 customerInDb.Name = customer.Name;             customerInDb.Birthday = customer.Birthday;             customerInDb.IsSubscribedToNewsletter = customer.IsSubscribedToNewsletter;             customerInDb.MembershipType = customer.MembershipType;               _context.SaveChanges();         }           [HttpDelete]         public void DeleteCustomer(int id)         {               var customerInDb = _context.Customers.SingleOrDefault(c => c.Id == id);               if (customerInDb == null)                 throw new HttpResponseException(HttpStatusCode.BadRequest);               _context.Customers.Remove(customerInDb);             _context.SaveChanges();         }     } }

Improvement of the code: We can replace ActionResult by IHttpActionResult, then

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1	throw new HttpResponseException(HttpStatusCode.BadRequest)

can be replaced by

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1	return BadRequest()

etc.