gistfile1.cs

public class Contact : IApiResource
{
    public int Id { get; set; }
    // ... other Contact Members

    public SetLocation(ResourceLocation location)
    {
        location.Location = new Uri("http://api.contoso.com/contacts/"+Id);
    }
}


public class ContactsController : ApiController
{
    public HttpResponseMessage Post(Contact contact)
    {
       //create new contact resource
       return new CreateResponse(contact);
    }
}