public IHttpActionResult PostCustomer(Customer customer)
 {
     WebApiFunContext db = new WebApiFunContext();
     db.Customers.Add(customer);
     db.SaveChanges();
     return Ok(customer);
 }
 public IHttpActionResult PutCustomer(Customer customer)
 {
     WebApiFunContext db = new WebApiFunContext();
     db.Entry(customer).State = System.Data.Entity.EntityState.Modified;
     db.SaveChanges();
     return Ok(customer);
 }
 public IHttpActionResult DeleteCustomer(int id)
 {
     WebApiFunContext db = new WebApiFunContext();
     var customer = db.Customers.Where(x => x.Id == id).FirstOrDefault();
     if (customer != null)
     {
         db.Customers.Remove(customer);
         db.SaveChanges();
         return Ok();
     }
     else
     {
         return NotFound();
     }
 }