public IEnumerable <Customer> GetCustomer()
 {
     using (var context = new dbContext_Customer())
     {
         return(context.Customers.ToList());
     }
 }
 public Customer GetCustomer(int customerId)
 {
     using (var context = new dbContext_Customer())
     {
         return(context.Customers.Where(c => c.ID == customerId).AsQueryable().FirstOrDefault());
     }
 }