entity type has no key defined - Code first
asp.net-mvc, entity-framework-4
Solution
Typically, code first by convention implicitely sets key for entity type if property is named `Id` or `TypeName+Id`. In your case, `TypeId` is neither of them, so you should explicitely mark it as key, using KeyAttribute or with fluent syntax, using EntityTypeConfiguration.HasKey Method
Problem
I'm new to MVC as well as the entity framework. I searched lot and find few similar questions (e.g. Entity Type Has No Key Defined) but they don't solve my problem. ``` namespace MvcAppInvoice.Models { public class Customer { public int CustomerID { get; set; } public string FirstName { get; set; } public string SurName { get; set; } public virtual CustomerType Type { get; set; } } public class CustomerType { public int TypeId { get; set; } public string TypeName { get; set; } public virtual ICollection<Customer> customers { get; set; } } } ``` When I try to add the controller it gives the following error: